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1. Long-time asymptotics for the derivative nonlinear Schrodinger equation on the half-line Arruda, Lynnyngs Kellyet al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_0_j_idt672",{id:"formSmash:items:resultList:0:j_idt672",widgetVar:"widget_formSmash_items_resultList_0_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:0:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Lenells, JonatanKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:0:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Long-time asymptotics for the derivative nonlinear Schrodinger equation on the half-line2017Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 30, nr 11, s. 4141-4172Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_0_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:0:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_0_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We derive asymptotic formulas for the solution of the derivative nonlinear Schrodinger equation on the half-line under the assumption that the initial and boundary values lie in the Schwartz class. The formulas clearly show the effect of the boundary on the solution. The approach is based on a nonlinear steepest descent analysis of an associated Riemann-Hilbert problem.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:0:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 2. On the ratio probability of the smallest eigenvalues in the Laguerre unitary ensemble Atkin, Max R.et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_1_j_idt672",{id:"formSmash:items:resultList:1:j_idt672",widgetVar:"widget_formSmash_items_resultList_1_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:1:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Charlier, ChristopheKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.).Zohren, StefanPrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:1:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); On the ratio probability of the smallest eigenvalues in the Laguerre unitary ensemble2018Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 31, nr 4, s. 1155-1196Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_1_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:1:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_1_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study the probability distribution of the ratio between the second smallest and smallest eigenvalue in the n x n Laguerre unitary ensemble. The probability that this ratio is greater than r > 1 is expressed in terms of an n x n Hankel determinant with a perturbed Laguerre weight. The limiting probability distribution for the ratio as n -> infinity is found as an integral over (0, infinity) containing two functions q(1)(x) and q(2)(x). These functions satisfy a system of two coupled Painleve V equations, which are derived from a Lax pair of a Riemann-Hilbert problem. We compute asymptotic behaviours of these functions as rx -> 0(+) and (r - 1)x -> infinity, as well as large n asymptotics for the associated Hankel determinants in several regimes of r and x.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:1:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 3. Trajectories of a DAE near a pseudo-equilibrium Beardmore, R. E.et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_2_j_idt672",{id:"formSmash:items:resultList:2:j_idt672",widgetVar:"widget_formSmash_items_resultList_2_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:2:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Laister, R.Peplow, AndrewKTH, Tidigare Institutioner (före 2005), Farkostteknik.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:2:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Trajectories of a DAE near a pseudo-equilibrium2004Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 17, nr 1, s. 253-279Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_2_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:2:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_2_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We consider a class of differential-algebraic equations (DAEs) defined by analytic nonlinearities and study its singular solutions. The main assumption used is that the linearization of the DAE represents a Kronecker index-2 matrix pencil and that the constraint manifold has a quadratic fold along its singularity. From these assumptions we obtain a normal form for the DAE where the presence of the singularity and its effects on the dynamics of the problem are made explicit in the form of a quasi-linear differential equation. Subsequently, two distinct types of singular points are identified through which there pass exactly two analytic solutions: pseudo-nodes and pseudo-saddles. We also demonstrate that a singular point called a pseudo-node supports an uncountable infinity of solutions which are not analytic in general. Moreover, akin to known results in the literature for DAEs with singular equilibria, a degenerate singularity is found through which there passes one analytic solution such that the singular point in question is contained within a quasi-invariant manifold of solutions. We call this type of singularity a pseudo-centre and it provides not only a manifold of solutions which intersects the singularity, but also a local flow on that manifold which solves the DAE.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:2:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 4. On the non-chiral intermediate long wave equation Berntson, Bjorn K. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_3_j_idt669",{id:"formSmash:items:resultList:3:j_idt669",widgetVar:"widget_formSmash_items_resultList_3_j_idt669",onLabel:"Berntson, Bjorn K. ",offLabel:"Berntson, Bjorn K. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_3_j_idt672",{id:"formSmash:items:resultList:3:j_idt672",widgetVar:"widget_formSmash_items_resultList_3_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:3:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Langmann, EdwinKTH, Skolan för teknikvetenskap (SCI), Fysik.Lenells, JonatanKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:3:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); On the non-chiral intermediate long wave equation2022Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 35, nr 8, s. 4549-4584Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_3_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:3:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_3_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study integrability properties of the non-chiral intermediate long wave equation recently introduced by the authors as a parity-invariant variant of the intermediate long wave equation. For this new equation we: (a) derive a Lax pair, (b) derive a Hirota bilinear form,

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:3:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 5. On the non-chiral intermediate long wave equation Berntson, Bjorn K. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_4_j_idt669",{id:"formSmash:items:resultList:4:j_idt669",widgetVar:"widget_formSmash_items_resultList_4_j_idt669",onLabel:"Berntson, Bjorn K. ",offLabel:"Berntson, Bjorn K. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_4_j_idt672",{id:"formSmash:items:resultList:4:j_idt672",widgetVar:"widget_formSmash_items_resultList_4_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.). KTH, Skolan för teknikvetenskap (SCI), Fysik.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:4:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Langmann, EdwinKTH, Skolan för teknikvetenskap (SCI), Fysik.Lenells, JonatanKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:4:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); On the non-chiral intermediate long wave equation: II. Periodic case2022Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 35, nr 8, s. 4517-4548Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_4_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:4:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_4_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study integrability properties of the non-chiral intermediate long wave (ncILW) equation with periodic boundary conditions. The ncILW equation was recently introduced by the authors as a parity-invariant relative of the intermediate long wave equation. For this new equation we: (a) derive a Lax pair, (b) derive a Hirota bilinear form,

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:4:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 6. Periodic solutions of the non-chiral intermediate Heisenberg ferromagnet equation described by elliptic spin Calogero-Moser dynamics Berntson, Björn K. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_5_j_idt669",{id:"formSmash:items:resultList:5:j_idt669",widgetVar:"widget_formSmash_items_resultList_5_j_idt669",onLabel:"Berntson, Björn K. ",offLabel:"Berntson, Björn K. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_5_j_idt672",{id:"formSmash:items:resultList:5:j_idt672",widgetVar:"widget_formSmash_items_resultList_5_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Fysik.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:5:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Klabbers, RobHumboldt Univ, Inst Phys, Zum Grossen Windkanal 2, D-12489 Berlin, Germany..PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:5:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Periodic solutions of the non-chiral intermediate Heisenberg ferromagnet equation described by elliptic spin Calogero-Moser dynamics2023Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 36, nr 6, s. 3068-3108Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_5_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:5:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_5_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We present a class of periodic solutions of the non-chiral intermediate Heisenberg ferromagnet equation, which was recently introduced by the authors together with Langmann as a classical, continuum limit of an Inozemtsev-type spin chain. These exact analytic solutions are constructed via a spin-pole ansatz written in terms of certain elliptic functions. The dynamical parameters in our solutions solve an elliptic spin Calogero-Moser (CM) system subject to certain constraints. In the course of our construction, we establish a novel Backlund transformation for this constrained elliptic spin CM system.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:5:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 7. Attractors in the quasi-periodically perturbed quadratic family Bjerklöv, Kristian PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_6_j_idt669",{id:"formSmash:items:resultList:6:j_idt669",widgetVar:"widget_formSmash_items_resultList_6_j_idt669",onLabel:"Bjerklöv, Kristian ",offLabel:"Bjerklöv, Kristian ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:6:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:6:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Attractors in the quasi-periodically perturbed quadratic family2012Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 25, nr 5, s. 1537-1545Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_6_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:6:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_6_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We give a geometric description of an attractor arising in quasi-periodically perturbed maps T x [0, 1] (sic) (theta, x) bar right arrow (theta + omega, c(theta)x(1 - x)) is an element of T x [0, 1] for certain choices of smooth c : T -> [1.5, 4] and Diophantine omega. The existence of the 'strange' attractor was established in Bjerklov 2009 Commun. Math. Phys. 286 137.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:6:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 8. Quasi-periodic perturbation of unimodal maps exhibiting an attracting 3-cycle Bjerklöv, Kristian PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_7_j_idt669",{id:"formSmash:items:resultList:7:j_idt669",widgetVar:"widget_formSmash_items_resultList_7_j_idt669",onLabel:"Bjerklöv, Kristian ",offLabel:"Bjerklöv, Kristian ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:7:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:7:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Quasi-periodic perturbation of unimodal maps exhibiting an attracting 3-cycle2012Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 25, nr 3, s. 683-741Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_7_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:7:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_7_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study a class of smooth maps Phi : T x [0, 1]. T x [0, 1] of the form theta bar right arrow theta + omega x bar right arrow c(theta)h(x) where h : [0, 1] --> [0, 1] is a unimodal map exhibiting an attracting periodic point of prime period 3, and omega is irrational (T = R/Z). We show that the following phenomenon can occur for certain h and c : T --> R: There exists a single measurable function psi : T --> [0, 1] whose graph attracts (exponentially fast) a.e. (theta, x) is an element of T x [0, 1] under forward iterations of the map Phi. Moreover, the graph of psi is dense in a cylinder M subset of T x [0, 1]. Furthermore, for every integer n >= 1 there exists n distinct repelling continuous curves Gamma(k) : (theta, phi(k)(theta))(theta is an element of T), all lying in M, such that Phi(Gamma(k)) = Gamma(k+1) (k < n) and Phi(Gamma(n)) = Gamma(1). We give concrete examples where both c(theta) and h(x) are real-analytic, but in the analysis we only need that they are C-1. In our setting the function c(theta) will be very close to 1 for all theta outside a tiny interval; on the interval c(theta) > 1 makes a small bump. Thus we cause the perturbation of h by rare quasi-periodic kicking.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:7:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 9. Some remarks on the dynamics of the almost Mathieu equation at critical coupling* Bjerklöv, Kristian PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_8_j_idt669",{id:"formSmash:items:resultList:8:j_idt669",widgetVar:"widget_formSmash_items_resultList_8_j_idt669",onLabel:"Bjerklöv, Kristian ",offLabel:"Bjerklöv, Kristian ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:8:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:8:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Some remarks on the dynamics of the almost Mathieu equation at critical coupling*2020Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 33, nr 6, s. 2707-2722Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_8_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:8:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_8_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We show that the quasi-periodic Schrodinger cocycle with a continuous potential is of parabolic type, with a unique invariant section, at all gap edges where the Lyapunov exponent vanishes. This applies, in particular, to the almost Mathieu equation with critical coupling. It also provides examples of real-analytic cocycles having a unique invariant section which is not smooth.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:8:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 10. Universal asymptotics in hyperbolicity breakdown Bjerklöv, Kristianet al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_9_j_idt672",{id:"formSmash:items:resultList:9:j_idt672",widgetVar:"widget_formSmash_items_resultList_9_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:9:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Saprykina, MariaKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:9:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Universal asymptotics in hyperbolicity breakdown2008Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 21, nr 3, s. 557-586Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_9_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:9:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_9_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study a scenario for the disappearance of hyperbolicity of invariant tori in a class of quasi-periodic systems. In this scenario, the system loses hyperbolicity because two invariant directions come close to each other, losing their regularity. In a recent paper, based on numerical results, Haro and de la Llave (2006 Chaos 16 013120) discovered a quantitative universality in this scenario, namely, that the minimal angle between the two invariant directions has a power law dependence on the parameters and the exponents of the power law are universal. We present an analytic proof of this result.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:9:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 11. Symmetric solutions of evolutionary partial differential equations Bruell, Gabrieleet al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_10_j_idt672",{id:"formSmash:items:resultList:10:j_idt672",widgetVar:"widget_formSmash_items_resultList_10_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:10:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Ehrnstrom, MatsGeyer, AnnaPei, LongKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:10:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Symmetric solutions of evolutionary partial differential equations2017Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 30, nr 10, s. 3932-3950Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_10_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:10:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_10_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We show that for a large class of evolutionary nonlinear and nonlocal partial differential equations, symmetry of solutions implies very restrictive properties of the solutions and symmetry axes. These restrictions are formulated in terms of three principles, based on the structure of the equations. The first principle covers equations that allow for steady solutions and shows that any spatially symmetric solution is in fact steady with a speed determined by the motion of the axis of symmetry at the initial time. The second principle includes equations that admit breathers and steady waves, and therefore is less strong: it holds that the axes of symmetry are constant in time. The last principle is a mixed case, when the equation contains terms of the kind from both earlier principles, and there may be different outcomes; for a class of such equations one obtains that a spatially symmetric solution must be constant in both time and space. We list and give examples of more than 30 well-known equations and systems in one and several dimensions satisfying these principles; corresponding results for weak formulations of these equations may be attained using the same techniques. Our investigation is a generalisation of a local and one-dimensional version of the first principle from EhrnstrOm et al (2009 Int. Math. Res. Not. 2009 4578-96) to nonlocal equations, systems and higher dimensions, as well as a study of the standing and mixed cases.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:10:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 12. Exponential moments for disk counting statistics of random normal matrices in the critical regime Charlier, Christophe PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_11_j_idt669",{id:"formSmash:items:resultList:11:j_idt669",widgetVar:"widget_formSmash_items_resultList_11_j_idt669",onLabel:"Charlier, Christophe ",offLabel:"Charlier, Christophe ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_11_j_idt672",{id:"formSmash:items:resultList:11:j_idt672",widgetVar:"widget_formSmash_items_resultList_11_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Lund Univ, Ctr Math Sci, S-22100 Lund, Sweden..PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:11:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Lenells, JonatanKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:11:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Exponential moments for disk counting statistics of random normal matrices in the critical regime2023Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 36, nr 3, s. 1593-1616Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_11_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:11:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_11_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We obtain large n asymptotics for the m-point moment generating function of the disk counting statistics of the Mittag-Leffler ensemble, where n is the number of points of the process and m is arbitrary but fixed. We focus on the critical regime where all disk boundaries are merging at speed n(- 1/2), either in the bulk or at the edge. As corollaries, we obtain two central limit theorems and precise large n asymptotics of all joint cumulants (such as the covariance) of the disk counting function. Our results can also be seen as large n asymptotics for n x n determinants with merging planar discontinuities.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:11:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 13. The multiplicative constant for the Meijer-G kernel determinant Charlier, Christophe PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_12_j_idt669",{id:"formSmash:items:resultList:12:j_idt669",widgetVar:"widget_formSmash_items_resultList_12_j_idt669",onLabel:"Charlier, Christophe ",offLabel:"Charlier, Christophe ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_12_j_idt672",{id:"formSmash:items:resultList:12:j_idt672",widgetVar:"widget_formSmash_items_resultList_12_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:12:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Lenells, JonatanKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).Mauersberger, JulianKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:12:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); The multiplicative constant for the Meijer-G kernel determinant2021Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 34, nr 5, s. 2837-2877Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_12_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:12:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_12_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We compute the multiplicative constant in the large gap asymptotics of the Meijer-G point process. This point process generalizes the Bessel point process and appears at the hard edge of Cauchy-Laguerre multi-matrix models and of certain product random matrix ensembles.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:12:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 14. Analytic genericity of diffusing orbits in a priori unstable Hamiltonian systems Chen, Qinbo PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_13_j_idt669",{id:"formSmash:items:resultList:13:j_idt669",widgetVar:"widget_formSmash_items_resultList_13_j_idt669",onLabel:"Chen, Qinbo ",offLabel:"Chen, Qinbo ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_13_j_idt672",{id:"formSmash:items:resultList:13:j_idt672",widgetVar:"widget_formSmash_items_resultList_13_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:13:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); de la Llave, RafaelGeorgia Inst Technol, Sch Math, Atlanta, GA 30332 USA..PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:13:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Analytic genericity of diffusing orbits in a priori unstable Hamiltonian systems2022Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 35, nr 4, s. 1986-2019Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_13_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:13:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_13_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); The genericity of Arnold diffusion in the analytic category is an open problem. In this paper, we study this problem in the following a priori unstable Hamiltonian system with a time-periodic perturbation H-epsilon(p, q, I, phi, t) = h(I) + Sigma(n)(i=1) +/- (1/2 p(i)(2) + V-i(q(i))) + epsilon H-1( p, q, I, phi, t), where (p, q) epsilon R-n x T-n, (I,phi) epsilon R-d x T-d with n, d >= 1, V-i are Morse potentials, and epsilon is a small non-zero parameter. The unperturbed Hamiltonian is not necessarily convex, and the induced inner dynamics does not need to satisfy a twist condition. Using geometric methods we prove that Arnold diffusion occurs for generic analytic perturbations H-1. Indeed, the set of admissible H-1 is C-omega dense and C-3 open (a fortiori, C-omega open). Our perturbative technique for the genericity is valid in the C-k topology for all k epsilon [ 3,8) boolean OR {infinity,omega}.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:13:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 15. Inverse scattering transform for the Degasperis-Procesi equation Constantin, A.et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_14_j_idt672",{id:"formSmash:items:resultList:14:j_idt672",widgetVar:"widget_formSmash_items_resultList_14_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:14:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Ivanov, R. I.Lenells, JonatanInstitut für Angewandte Mathematik, Leibniz Universität Hannover, Hannover, Germany .PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:14:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Inverse scattering transform for the Degasperis-Procesi equation2010Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 23, nr 10, s. 2559-2575Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_14_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:14:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_14_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We develop the inverse scattering transform (IST) method for the Degasperis- Procesi equation. The spectral problem is an sl(3) Zakharov-Shabat problem with constant boundary conditions and finite reduction group. The basic aspects of the IST, such as the construction of fundamental analytic solutions, the formulation of a Riemann-Hilbert problem, and the implementation of the dressing method, are presented.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:14:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 16. A vector equilibrium problem for the two-matrix model in the quartic/quadratic case Duits, Maurice PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_15_j_idt669",{id:"formSmash:items:resultList:15:j_idt669",widgetVar:"widget_formSmash_items_resultList_15_j_idt669",onLabel:"Duits, Maurice ",offLabel:"Duits, Maurice ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_15_j_idt672",{id:"formSmash:items:resultList:15:j_idt672",widgetVar:"widget_formSmash_items_resultList_15_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); CALTECH, Pasadena.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:15:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Geudens, DriesKuijlaars, Arno B. J.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:15:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); A vector equilibrium problem for the two-matrix model in the quartic/quadratic case2011Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 24, nr 3, s. 951-993Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_15_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:15:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_15_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We consider the two sequences of biorthogonal polynomials (p(k,n))(k=0)(infinity) and (q(k,n))(k=0)(infinity) related to the Hermitian two-matrix model with potentials V (x) = x(2)/2 and W(y) = y(4)/4 + ty(2). From an asymptotic analysis of the coefficients in the recurrence relation satisfied by these polynomials, we obtain the limiting distribution of the zeros of the polynomials p(n,n) as n -> infinity. The limiting zero distribution is characterized as the first measure of the minimizer in a vector equilibrium problem involving three measures which for the case t = 0 reduces to the vector equilibrium problem that was given recently by two of us. A novel feature is that for t < 0 an external field is active on the third measure which introduces a new type of critical behaviour for a certain negative value of t.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:15:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 17. Explicit soliton asymptotics for the Korteweg-de Vries equation on the half-line Fokas, A. S.et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_16_j_idt672",{id:"formSmash:items:resultList:16:j_idt672",widgetVar:"widget_formSmash_items_resultList_16_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:16:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Lenells, JonatanPrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:16:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Explicit soliton asymptotics for the Korteweg-de Vries equation on the half-line2010Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 23, nr 4, s. 937-976Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_16_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:16:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_16_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); There exists a distinctive class of physically significant evolution PDEs in one spatial dimension which can be treated analytically. A prototypical example of this class (which is referred to as integrable) is the Korteweg-de Vries equation. Integrable PDEs on the line can be analysed by the so-called inverse scattering transform (IST) method. A particularly powerful aspect of the IST is its ability to predict the large t behaviour of the solution. Namely, starting with initial data u(x, 0), IST implies that the solution u(x, t) asymptotes to a collection of solitons as t → ∞, x/t = O(1); moreover, the shapes and speeds of these solitons can be computed from u(x, 0) using only linear operations. One of the most important developments in this area has been the generalization of the IST from initial to initial-boundary value (IBV) problems formulated on the half-line. It can be shown that again u(x, t) asymptotes into a collection of solitons, where now the shapes and the speeds of these solitons depend both on u(x, 0) and on the given boundary conditions at x = 0. A major complication of IBV problems is that the computation of the shapes and speeds of the solitons involves the solution of a nonlinear Volterra integral equation. However, for a certain class of boundary conditions, called linearizable, this complication can be bypassed and the relevant computation is as effective as in the case of the problem on the line. Here, after reviewing the general theory for KdV, we analyse three different types of linearizable boundary conditions. For these cases, the initial conditions are (a) restrictions of one- and two-soliton solutions at t = 0; (b) profiles of certain exponential type and (c) box-shaped profiles. For each of these cases, by computing explicitly the shapes and the speeds of the asymptotic solitons, we elucidate the influence of the boundary.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:16:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 18. Effective dynamics for boson stars Froehlich, J.et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_17_j_idt672",{id:"formSmash:items:resultList:17:j_idt672",widgetVar:"widget_formSmash_items_resultList_17_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:17:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Jonsson, B. Lars G.KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.Lenzmann, E.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:17:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Effective dynamics for boson stars2007Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 20, nr 5, s. 1031-1075Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_17_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:17:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_17_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study solutions close to solitary waves of the pseudo-relativistic Hartree equation describing boson stars under the influence of an external gravitational field. In particular, we analyse the long-time effective dynamics of such solutions. In essence, we establish a ( long-time) stability result for solutions describing boson stars that move under the influence of an external gravitational field. The proof of our main result tackles difficulties that are absent when deriving similar results on effective solitary wave motions for nonlinear Schrodinger equations or nonlinear wave equations. This is due to the fact that the pseudo-relativisitic Hartree equation does not exhibit Galilean or Lorentz covariance.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:17:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 19. Cylinder renormalization for Siegel discs and a constructive measurable Riemann mapping theorem Gaidash, Denis G. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_18_j_idt669",{id:"formSmash:items:resultList:18:j_idt669",widgetVar:"widget_formSmash_items_resultList_18_j_idt669",onLabel:"Gaidash, Denis G. ",offLabel:"Gaidash, Denis G. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:18:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:18:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Cylinder renormalization for Siegel discs and a constructive measurable Riemann mapping theorem2007Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 20, nr 3, s. 713-741Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_18_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:18:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_18_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); The boundary of the Siegel disc of a quadratic polynomial with an irrationally indifferent fixed point with the golden mean rotation number has been observed to be self-similar. The geometry of this self-similarity is universal for a large class of holomorphic maps. A renormalization explanation of this universality has been proposed in the literature. However, one of the ingredients of this explanation, the hyperbolicity of renormalization, has not yet been proved. The present work considers a cylinder renormalization-a novel type of renormalization for holomorphic maps with a Siegel disc which is better suited for a hyperbolicity proof. A key element of a cylinder renormalization of a holomorphic map is a conformal isomorphism of a dynamical quotient of a subset of C to a bi-infinite cylinder C/Z. A construction of this conformal isomorphism is an implicit procedure which can be performed using the measurable Riemann mapping theorem. We present a constructive proof of the measurable Riemann mapping theorem and obtain rigorous bounds on a numerical approximation of the desired conformal isomorphism. Such control of the uniformizing conformal coordinate is of key importance for a rigorous computer-assisted study of cylinder renormalization.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:18:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 20. Existence of a Lorenz renormalization fixed point of an arbitrary critical order Gaidashev, Denis PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_19_j_idt669",{id:"formSmash:items:resultList:19:j_idt669",widgetVar:"widget_formSmash_items_resultList_19_j_idt669",onLabel:"Gaidashev, Denis ",offLabel:"Gaidashev, Denis ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_19_j_idt672",{id:"formSmash:items:resultList:19:j_idt672",widgetVar:"widget_formSmash_items_resultList_19_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Uppsala univ., Uppsala, Sweden .PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:19:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Winckler, BjörnKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Optimeringslära och systemteori.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:19:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Existence of a Lorenz renormalization fixed point of an arbitrary critical order2012Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 25, nr 6, s. 1819-1841Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_19_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:19:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_19_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We present a proof of the existence of a renormalization fixed point for Lorenz maps of the simplest non-unimodal combinatorial type ({0, 1}, {1, 0, 0}) and with a critical point of arbitrary order rho > 1.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:19:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 21. Attractors near grazing-sliding bifurcations Glendinning, P. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_20_j_idt669",{id:"formSmash:items:resultList:20:j_idt669",widgetVar:"widget_formSmash_items_resultList_20_j_idt669",onLabel:"Glendinning, P. ",offLabel:"Glendinning, P. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_20_j_idt672",{id:"formSmash:items:resultList:20:j_idt672",widgetVar:"widget_formSmash_items_resultList_20_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Univ Manchester, Manchester, Lancs, England.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:20:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Kowalczyk, P.Manchester Metropolitan Univ, Manchester, Lancs, England.Nordmark, Arne B.KTH, Skolan för teknikvetenskap (SCI), Mekanik.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:20:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Attractors near grazing-sliding bifurcations2012Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 25, nr 6, s. 1867-1885Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_20_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:20:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_20_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); In this paper we prove, for the first time, that multistability can occur in three-dimensional Fillipov type flows due to grazing-sliding bifurcations. We do this by reducing the study of the dynamics of Filippov type flows around a grazing-sliding bifurcation to the study of appropriately defined one-dimensional maps. In particular, we prove the presence of three qualitatively different types of multiple attractors born in grazing-sliding bifurcations. Namely, a period-two orbit with a sliding segment may coexist with a chaotic attractor, two stable, period-two and period-three orbits with a segment of sliding each may coexist, or a non-sliding and period-three orbit with two sliding segments may coexist.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:20:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 22. Matrix elements for the quantum cat map Kurlberg, Pär PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_21_j_idt669",{id:"formSmash:items:resultList:21:j_idt669",widgetVar:"widget_formSmash_items_resultList_21_j_idt669",onLabel:"Kurlberg, Pär ",offLabel:"Kurlberg, Pär ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_21_j_idt672",{id:"formSmash:items:resultList:21:j_idt672",widgetVar:"widget_formSmash_items_resultList_21_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:21:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Rosenzweig, LiorRudnick, ZeevPrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:21:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Matrix elements for the quantum cat map: fluctuations in short windows2007Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 20, nr 10, s. 2289-2304Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_21_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:21:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_21_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study fluctuations of the matrix coefficients for the quantized cat map. We consider the sum of matrix coefficients corresponding to eigenstates whose eigenphases lie in a randomly chosen window, assuming that the length of the window shrinks with Planck's constant. We show that if the length of the window is smaller than the square root of Planck's constant, but larger than the separation between distinct eigenphases, then the variance of this sum is proportional to the length of the window, with a proportionality constant which coincides with the variance of the individual matrix elements corresponding to Hecke eigenfunctions.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:21:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 23. The defect of toral Laplace eigenfunctions and arithmetic random waves Kurlberg, Pär PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_22_j_idt669",{id:"formSmash:items:resultList:22:j_idt669",widgetVar:"widget_formSmash_items_resultList_22_j_idt669",onLabel:"Kurlberg, Pär ",offLabel:"Kurlberg, Pär ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_22_j_idt672",{id:"formSmash:items:resultList:22:j_idt672",widgetVar:"widget_formSmash_items_resultList_22_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:22:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Wigman, IgorKings Coll London, Dept Math, London WC2R 2LS, England..Yesha, NadavUniv Haifa, Dept Math, IL-3498838 Haifa, Israel..PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:22:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); The defect of toral Laplace eigenfunctions and arithmetic random waves2021Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 34, nr 9, s. 6651-6684Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_22_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:22:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_22_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study the defect (or 'signed area') distribution of standard toral Laplace eigenfunctions restricted to shrinking balls of radius above the Planck scale, either for deterministic eigenfunctions averaged w.r.t. the spatial variable, or in a random Gaussian scenario ('arithmetic random waves'). In either case we exploit the associated symmetry of the eigenfunctions to show that the expectation (spatial or Gaussian) vanishes. In the deterministic setting, we prove that the variance of the defect of flat eigenfunctions, restricted to balls shrinking above the Planck scale, vanishes for 'most' energies. Hence the defect of eigenfunctions restricted to most of the said balls is small. We also construct 'esoteric' eigenfunctions with large defect variance, by choosing our eigenfunctions so that to mimic the situation on the hexagonal torus, thus breaking the symmetries associated to the standard torus. In the random Gaussian setting, we establish various upper and lower bounds for the defect variance w.r.t. the Gaussian probability measure. A crucial ingredient in the proof of the lower bound is the use of Schmidt's subspace theorem.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:22:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 24. Boundary-value problems for the stationary axisymmetric Einstein equations Lenells, Jonatan PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_23_j_idt669",{id:"formSmash:items:resultList:23:j_idt669",widgetVar:"widget_formSmash_items_resultList_23_j_idt669",onLabel:"Lenells, Jonatan ",offLabel:"Lenells, Jonatan ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_23_j_idt672",{id:"formSmash:items:resultList:23:j_idt672",widgetVar:"widget_formSmash_items_resultList_23_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Baylor University, United States .PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:23:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Fokas, A. S.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:23:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Boundary-value problems for the stationary axisymmetric Einstein equations: A rotating disc2011Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 24, nr 1, s. 177-206Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_23_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:23:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_23_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); The stationary, axisymmetric reduction of the vacuum Einstein equations, the so-called Ernst equation, is an integrable nonlinear PDE in two dimensions. There now exists a general method for analysing boundary-value problems (BVPs) for integrable PDEs, and this method consists of two steps: (a) Construct an integral representation of the solution characterized via a matrix RiemannHilbert (RH) problem formulated in the complex k-plane, where k denotes the spectral parameter of the associated Lax pair. This representation involves, in general, some unknown boundary values, thus the solution formula is not yet effective. (b) Characterize the unknown boundary values by analysing a certain equation called the global relation. This analysis involves, in general, the solution of a nonlinear problem; however, for certain BVPs called linearizable, it is possible to determine the unknown boundary values using only linear operations. Here, we employ the above methodology for the investigation of certain BVPs for the elliptic version of the Ernst equation. For this problem, the main novelty is the occurrence of the spectral parameter in the form of a square root and this necessitates the introduction of a two-sheeted Riemann surface for the formulation of the relevant RH problem. As a concrete application of the general formalism, it is shown that the particular BVP corresponding to the physically significant case of a rotating disc is a linearizable BVP. In this way the remarkable results of Neugebauer and Meinel are recovered.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:23:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 25. On a novel integrable generalization of the nonlinear Schrödinger equation Lenells, Jonatan PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_24_j_idt669",{id:"formSmash:items:resultList:24:j_idt669",widgetVar:"widget_formSmash_items_resultList_24_j_idt669",onLabel:"Lenells, Jonatan ",offLabel:"Lenells, Jonatan ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_24_j_idt672",{id:"formSmash:items:resultList:24:j_idt672",widgetVar:"widget_formSmash_items_resultList_24_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); University of Cambridge, United Kingdom .PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:24:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Fokas, A. S.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:24:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); On a novel integrable generalization of the nonlinear Schrödinger equation2009Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 22, nr 1, s. 11-27Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_24_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:24:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_24_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We consider an integrable generalization of the nonlinear Schrödinger (NLS) equation that was recently derived by one of the authors using bi-Hamiltonian methods. This equation is related to the NLS equation in the same way as the Camassa-Holm equation is related to the KdV equation. In this paper we (a) use the bi-Hamiltonian structure to write down the first few conservation laws, (b) derive a Lax pair, (c) use the Lax pair to solve the initial value problem and (d) analyse solitons.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:24:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 26. Asymptotic analysis of selection-mutation models in the presence of multiple fitness peaks Lorenzi, Tommaso PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_25_j_idt669",{id:"formSmash:items:resultList:25:j_idt669",widgetVar:"widget_formSmash_items_resultList_25_j_idt669",onLabel:"Lorenzi, Tommaso ",offLabel:"Lorenzi, Tommaso ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_25_j_idt672",{id:"formSmash:items:resultList:25:j_idt672",widgetVar:"widget_formSmash_items_resultList_25_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Univ St Andrews, Sch Math & Stat, St Andrews, Fife, Scotland.;Politecn Torino, Dipartimento Eccellenza 2018 2022, Dept Math Sci GL Lagrange, I-10129 Turin, Italy..PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:25:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Pouchol, CamilleKTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.). Sorbonne Univ, CNRS, UMR 7598, Lab Jacques Louis Lions, F-75005 Paris, France.;Univ Paris 05, MAP5, 45 Rue St Peres, F-75006 Paris, France..PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:25:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Asymptotic analysis of selection-mutation models in the presence of multiple fitness peaks2020Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 33, nr 11, s. 5791-5816Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_25_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:25:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_25_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study the long-time behaviour of phenotype-structured models describing the evolutionary dynamics of asexual populations whose phenotypic fitness landscape is characterised by multiple peaks. First we consider the case where phenotypic changes do not occur, and then we include the effect of heritable phenotypic changes. In the former case the model is formulated as an integrodifferential equation for the phenotype distribution of the individuals in the population, whereas in the latter case the evolution of the phenotype distribution is governed by a non-local parabolic equation whereby a linear diffusion operator captures the presence of phenotypic changes. We prove that the long-time limit of the solution to the integrodifferential equation is unique and given by a measure consisting of a weighted sum of Dirac masses centred at the peaks of the phenotypic fitness landscape. We also derive an explicit formula to compute the weights in front of the Dirac masses. Moreover, we demonstrate that the long-time solution of the non-local parabolic equation exhibits a qualitatively similar behaviour in the asymptotic regime where the diffusion coefficient modelling the rate of phenotypic change tends to zero. However, we show that the limit measure of the non-local parabolic equation may consist of less Dirac masses, and we provide a sufficient criterion to identify the positions of their centres. Finally, we carry out a detailed characterisation of the speed of convergence of the integral of the solution (i.e. the population size) to its long-time limit for both models. Taken together, our results support a more in-depth theoretical understanding of the conditions leading to the emergence of stable phenotypic polymorphism in asexual populations.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:25:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 27. The hyperbolic Ernst-Maxwell equations in a triangular domain Mauersberger, Julian PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_26_j_idt669",{id:"formSmash:items:resultList:26:j_idt669",widgetVar:"widget_formSmash_items_resultList_26_j_idt669",onLabel:"Mauersberger, Julian ",offLabel:"Mauersberger, Julian ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:26:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:26:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); The hyperbolic Ernst-Maxwell equations in a triangular domain2020Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 33, nr 1, s. 511-537Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_26_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:26:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_26_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); In a recent paper, we applied Riemann-Hilbert techniques to analyze the Goursat problem for the hyperbolic Ernst equation, which describes the interaction of two colliding gravitational plane waves. Here we generalize this approach to colliding electromagnetic plane waves in Einstein-Maxwell theory.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:26:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 28. Existence of periodic orbits in grazing bifurcations of impacting mechanical oscillators Nordmark, Arne B. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_27_j_idt669",{id:"formSmash:items:resultList:27:j_idt669",widgetVar:"widget_formSmash_items_resultList_27_j_idt669",onLabel:"Nordmark, Arne B. ",offLabel:"Nordmark, Arne B. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Tidigare Institutioner (före 2005), Mekanik.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:27:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:27:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Existence of periodic orbits in grazing bifurcations of impacting mechanical oscillators2001Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 14, nr 6, s. 1517-1542Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_27_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:27:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_27_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Grazing bifurcations are local bifurcations that can occur in dynamical models of impacting mechanical systems. The motion resulting from a grazing bifurcation can be complex. In this paper we discuss the creation of periodic orbits associated with grazing bifurcations, and we give sufficient conditions for the existence of a such a family of orbits. We also give a numerical example for an impacting system with one degree of freedom.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:27:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 29. A codimension-two scenario of sliding solutions in grazing-sliding bifurcations Nordmark, Arne B. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_28_j_idt669",{id:"formSmash:items:resultList:28:j_idt669",widgetVar:"widget_formSmash_items_resultList_28_j_idt669",onLabel:"Nordmark, Arne B. ",offLabel:"Nordmark, Arne B. ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_28_j_idt672",{id:"formSmash:items:resultList:28:j_idt672",widgetVar:"widget_formSmash_items_resultList_28_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Mekanik, Biomekanik.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:28:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Kowalczyk, P.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:28:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); A codimension-two scenario of sliding solutions in grazing-sliding bifurcations2006Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 19, nr 1, s. 1-26Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_28_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:28:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_28_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); This paper investigates codimension-two bifurcations that involve grazing-sliding and fold scenarios. An analytical unfolding of this novel codimension-two bifurcation is presented. Using the discontinuity mapping techniques it is shown that the fold curve is one-sided and cubically tangent to the grazing curve locally to the codimension-two point. This theory is then applied to explain the dynamics of a dry-friction oscillator where such a codimension-two point has been found. In particular, the presence and the character of essential bifurcation curves that merge at the codimension-two point are confirmed. This allows us to study the dynamics away from the codimension-two point using a piecewise affine approximation of the normal form for grazing-sliding bifurcations and explain the dynamics observed in the friction system.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:28:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 30. Hopf bifurcation with <em>S</em><sub><em>N</em></sub>-symmetry Rodrigues, Ana PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_29_j_idt669",{id:"formSmash:items:resultList:29:j_idt669",widgetVar:"widget_formSmash_items_resultList_29_j_idt669",onLabel:"Rodrigues, Ana ",offLabel:"Rodrigues, Ana ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); et al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_29_j_idt672",{id:"formSmash:items:resultList:29:j_idt672",widgetVar:"widget_formSmash_items_resultList_29_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); CMUP and Departamento de Matemática Pura, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal .PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:29:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Dias, Ana Paula S.CMUP and Departamento de Matemática Pura, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal .PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:29:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Hopf bifurcation with*S*_{N}-symmetry2009Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 22, nr 3, s. 627-666Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_29_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:29:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_29_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study Hopf bifurcation with

*S*_{N}-symmetry for the standard absolutely irreducible action of*S*_{N}obtained from the action of*S*_{N}by permutation of*N*coordinates. Stewart (1996 Symmetry methods in collisionless many-body problems,*J. Nonlinear Sci.***6**543–63) obtains a classification theorem for the-axial subgroups of*C**S*_{N}**×***S*^{1}. We use this classification to prove the existence of branches of periodic solutions with-axial symmetry in systems of ordinary differential equations with*C**S*_{N}-symmetry posed on a direct sum of two such*S*_{N}-absolutely irreducible representations, as a result of a Hopf bifurcation occurring as a real parameter is varied. We determine the (generic) conditions on the coefficients of the fifth order*S*_{N}**×***S*^{1}-equivariant vector field that describe the stability and criticality of those solution branches. We finish this paper with an application to the cases*N*= 4 and*N*= 5.PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:29:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 31. Effective bifurcation analysis Runborg, Olofet al. PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_30_j_idt672",{id:"formSmash:items:resultList:30:j_idt672",widgetVar:"widget_formSmash_items_resultList_30_j_idt672",onLabel:"et al.",offLabel:"et al.",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:30:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Theodoropoulos, C.Kevrekidis, I. G.PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:30:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Effective bifurcation analysis: a time-stepper-based approach2002Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 15, nr 2, s. 491-511Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_30_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:30:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_30_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We introduce a numerical approach to perform the effective (coarse-scale) bifurcation analysis of solutions of dissipative evolution equations with spatially varying coefficients. The advantage of this approach is that the 'coarse model' (the averaged, effective equation) need not be explicitly constructed. The method only uses a time-integrator code for the detailed problem and judicious choices of initial data and integration times; the bifurcation computations are based on the so-called recursive projection method.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:30:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 32. Domain of analyticity of normalizing transformations Saprykina, Maria PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_31_j_idt669",{id:"formSmash:items:resultList:31:j_idt669",widgetVar:"widget_formSmash_items_resultList_31_j_idt669",onLabel:"Saprykina, Maria ",offLabel:"Saprykina, Maria ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:31:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:31:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Domain of analyticity of normalizing transformations2006Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 19, nr 7, s. 1581-1599Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_31_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:31:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_31_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We investigate questions of divergence or local convergence of (formal) normalizing transformations associated with the Birkhoff normal form (BNF) at the origin of a holomorphic Hamiltonian system. These questions are addressed for systems for which the BNF is a quadratic function H-Lambda = Sigma(d)(j=1) lambda(j) x(j) y(j), Lambda := (lambda(1),..., lambda(d)) being a non-resonant, either real or purely imaginary, vector. We prove that for a generic Lambda is an element of R-d or i Lambda is an element of R-d one can define Hamiltonians H = H-Lambda + (H) over cap satisfying the following properties: (i) H is real-analytic, holomorphic in the unit polydisc D(1), and H is defined arbitrarily close to H-Lambda, (ii) the BNF of H equals H-Lambda and (iii) any symplectic normalizing transformation diverges, or given any 0 < rho < 1 any normalizing transformation diverges outside the polydisc of radius rho, and there is a real-analytic normalizing transformation (converging in a smaller domain).

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:31:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 33. Positive Lyapunov exponents for quadratic skew-products over a Misiurewicz-Thurston map Schnellmann, Daniel PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_32_j_idt669",{id:"formSmash:items:resultList:32:j_idt669",widgetVar:"widget_formSmash_items_resultList_32_j_idt669",onLabel:"Schnellmann, Daniel ",offLabel:"Schnellmann, Daniel ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:32:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:32:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Positive Lyapunov exponents for quadratic skew-products over a Misiurewicz-Thurston map2009Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 22, s. 2681-2695Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_32_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:32:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_32_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We study a class of skew-products of quadratic maps-also called Viana maps-where the base dynamics is given by a high enough iteration of a Misiurewicz-Thurston quadratic map. We show that these systems admit two positive Lyapunov exponents.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:32:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 34. Unfolding of chaotic unimodal maps and the parameter dependence of natural measures Thunberg, HansPrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:33:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:33:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Unfolding of chaotic unimodal maps and the parameter dependence of natural measures2001Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 14, nr 2, s. 323-337Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_33_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:33:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_33_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); We consider one-parameter families f(a) of interval maps, and discuss the structure in parameter space and the (dis)continuity properties of the natural measure as a function of the parameter near certain strongly chaotic maps (post-critically finite Misiurewicz maps and Benedicks-Carleson maps). In particular, it is shown that the mapping a bar right arrow mu (a) (the natural measure of f(a)) is severely discontinuous at these strongly cli8dtii: maps and is not continuous on any full measure set of parameters in full, generic families. Going in the other direction, it is also shown that if such a chaotic map has a measure for which the critical point is generic, then this measure can be,approximated with measures supported on periodic attractors of nearby maps. The main idea is to construct cascades of post-critically finite Misiurewicz map and cascades of maps with periodic attractors, whose critical oibits reproduce various invariant sets of the unperturbed map. In the special case of the quadratic family, generalizations can be made to any non-renormalizable maps.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:33:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 35. Power law asymptotics in the creation of strange attractors in the quasi-periodically forced quadratic family Timoudas, Thomas Ohlson PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_34_j_idt669",{id:"formSmash:items:resultList:34:j_idt669",widgetVar:"widget_formSmash_items_resultList_34_j_idt669",onLabel:"Timoudas, Thomas Ohlson ",offLabel:"Timoudas, Thomas Ohlson ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:34:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:34:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); Power law asymptotics in the creation of strange attractors in the quasi-periodically forced quadratic family2017Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 30, nr 12, s. 4483-4522Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_34_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:34:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_34_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); Let Phi be a quasi-periodically forced quadratic map, where the rotation constant omega is a Diophantine irrational. A strange non-chaotic attractor (SNA) is an invariant (under Phi) attracting graph of a nowhere continuous measurable function psi from the circle T to [0, 1]. This paper investigates how a smooth attractor degenerates into a strange one, as a parameter beta approaches a critical value beta(0), and the asymptotics behind the bifurcation of the attractor from smooth to strange. In our model, the cause of the strange attractor is a so-called torus collision, whereby an attractor collides with a repeller. Our results show that the asymptotic minimum distance between the two colliding invariant curves decreases linearly in the parameter beta, as beta approaches the critical parameter value beta(0) from below. Furthermore, we have been able to show that the asymptotic growth of the supremum of the derivative of the attracting graph is asymptotically bounded from both sides by a constant times the reciprocal of the square root of the minimum distance above.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:34:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); 36. A renormalization fixed point for Lorenz maps Winckler, Björn PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_35_j_idt669",{id:"formSmash:items:resultList:35:j_idt669",widgetVar:"widget_formSmash_items_resultList_35_j_idt669",onLabel:"Winckler, Björn ",offLabel:"Winckler, Björn ",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:35:orgPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); PrimeFaces.cw("Panel","testPanel",{id:"formSmash:items:resultList:35:etAlPanel",widgetVar:"testPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500}); A renormalization fixed point for Lorenz maps2010Inngår i: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 23, nr 6, s. 1291-1302Artikkel i tidsskrift (Fagfellevurdert)Abstract [en] PrimeFaces.cw("SelectBooleanButton","widget_formSmash_items_resultList_35_j_idt714_0_j_idt715",{id:"formSmash:items:resultList:35:j_idt714:0:j_idt715",widgetVar:"widget_formSmash_items_resultList_35_j_idt714_0_j_idt715",onLabel:"Abstract [en]",offLabel:"Abstract [en]",onIcon:"ui-icon-triangle-1-s",offIcon:"ui-icon-triangle-1-e"}); A Lorenz map is a Poincare map for a three-dimensional Lorenz flow. We describe the theory of renormalization for Lorenz maps with a critical point and prove that a restriction of the renormalization operator acting on such maps has a hyperbolic fixed point. The proof is computer assisted and we include a detailed exposition on how to make rigorous estimates using a computer as well as the implementation of the estimates.

PrimeFaces.cw("Panel","tryPanel",{id:"formSmash:items:resultList:35:j_idt714:0:abstractPanel",widgetVar:"tryPanel",toggleable:true,toggleSpeed:500,collapsed:false,toggleOrientation:"vertical",closable:true,closeSpeed:500});

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