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  • 551.
    Nikolaou, Marios
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Lidmar, Jack
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Wallin, Mats
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Monte Carlo Simulations of a Lattice Gas with Logarithmic InteractionsManuscript (Other academic)
  • 552.
    Nikolaou, Marios
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Wallin, Mats
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Weber, Hans
    Department of Physics, Luleå University of Technology.
    Critical scaling properties at the superfluid transition of He-4 in aerogel2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 22, p. 225702-Article in journal (Refereed)
    Abstract [en]

    We study the superfluid transition of He-4 in aerogel by Monte Carlo simulations and finite size scaling analysis. Aerogel is a highly porous silica glass, which we model by a diffusion limited cluster aggregation model. The superfluid is modeled by a three dimensional XY model, with excluded bonds to sites on the aerogel cluster. We obtain the correlation length exponent nu=0.73 +/- 0.02, in reasonable agreement with experiments and with previous simulations. For the heat capacity exponent alpha, both experiments and previous simulations suggest deviations from the Josephson hyperscaling relation alpha=2-d nu. In contrast, our Monte Carlo results support hyperscaling with alpha=-0.2 +/- 0.05. We suggest a reinterpretation of the experiments, which avoids scaling violations and is consistent with our simulation results.

  • 553.
    Nikolic, Oliver
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Monte Carlo Simulation Study of 1D Josephson Junction Arrays2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 554.
    Nolinder, Anna
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Sandberg, Elin
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    The Klein-Gordon Equation and Pionic Atoms2014Independent thesis Basic level (degree of Bachelor), 10 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis introduces the Klein-Gordon equation and pionic atoms through

    a historical review. It discusses properties of the equation and its continuity equation

    based on a comparison with the Schrödinger equation and its continuity equation. The

    conclusion that the Klein-Gordon equation is a relativistic extension of the Schrödinger

    equation for spin-0 particles is drawn. This makes it possible to derive a Klein-Gordon

    equation and Coulomb potential based model for pionic atoms. The transition energies

    and the charge density for a pionic atom are derived. The model and a Schrödinger equation

    model are used to draw conclusions on the differences between regular and pionic

    atoms. Numerical predictions of the models are compared to experimental data and the

    accuracy of the models is discussed. Properties of the pionic atom are discussed based

    on the radial charge density.

  • 555.
    Nordström, Axel
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Magnetic Monopoles in Spin Ice2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 556.
    Novak, Wilhelm
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    – A study of the Langevin equation in a thermal ratchet model of the myosin V motor protein2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 557. Nussinov, Z.
    et al.
    Rosengren, Anders
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Exact ground states of extended t-J(z) models on a square lattice2007In: Philosophical Magazine Letters, ISSN 0950-0839, E-ISSN 1362-3036, Vol. 87, no 7, p. 515-526Article in journal (Refereed)
    Abstract [en]

    We examine special extended spin S = 1/2 fermionic and hard core bosonic t - J(z) models with nearest neighbour and next nearest neighbour interactions to find exact ground states. Some of these models display an exponentially large degeneracy with diagonal stripe-like patterns.

  • 558. Nyblom, Maria
    et al.
    Poulsen, Hanne
    Gourdon, Pontus
    Reinhard, Linda
    Andersson, Magnus
    KTH, School of Engineering Sciences (SCI), Theoretical Physics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Fedosova, Natalya
    Nissen, Poul
    Crystal Structure of Na+, K+-ATPase in the Na+-Bound State2013In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 342, no 6154, p. 123-127Article in journal (Refereed)
    Abstract [en]

    The Na+, K+-adenosine triphosphatase (ATPase) maintains the electrochemical gradients of Na+ and K+ across the plasma membrane-a prerequisite for electrical excitability and secondary transport. Hitherto, structural information has been limited to K+-bound or ouabain-blocked forms. We present the crystal structure of a Na+-bound Na+, K+-ATPase as determined at 4.3 angstrom resolution. Compared with the K+-bound form, large conformational changes are observed in the a subunit whereas the beta and gamma subunit structures are maintained. The locations of the three Na+ sites are indicated with the unique site III at the recently suggested IIIb, as further supported by electrophysiological studies on leak currents. Extracellular release of the third Na+ from IIIb through IIIa, followed by exchange of Na+ for K+ at sites I and II, is suggested.

  • 559. Nys, Mieke
    et al.
    Farinha, Ana
    Wijckmans, Eveline
    Brams, Marijke
    Yoluk, Özge
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Andersson, Magnus
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Ulens, Chris
    The Crystal Structure of ELIC in Complex with Chlorpromazine Unexpectedly Unveils an Allosteric Binding Site in the Ligand-Binding Domain2016In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 110, no 3, p. 457A-457AArticle in journal (Other academic)
  • 560. Nys, Mieke
    et al.
    Wijckmans, Eveline
    Farinha, Ana
    Yoluk, Özge
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Andersson, Magnus
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Brams, Marijke
    Spurny, Radovan
    Peigneur, Steve
    Tytgat, Jan
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab. Stockholm University, Sweden.
    Ulens, Chris
    Allosteric binding site in a Cys-loop receptor ligand-binding domain unveiled in the crystal structure of ELIC in complex with chlorpromazine2016In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 113, no 43, p. E6696-E6703Article in journal (Refereed)
    Abstract [en]

    Pentameric ligand-gated ion channels or Cys-loop receptors are responsible for fast inhibitory or excitatory synaptic transmission. The antipsychotic compound chlorpromazine is a widely used tool to probe the ion channel pore of the nicotinic acetylcholine receptor, which is a prototypical Cys-loop receptor. In this study, we determine the molecular determinants of chlorpromazine binding in the Erwinia ligand-gated ion channel (ELIC). We report the X-ray crystal structures of ELIC in complex with chlorpromazine or its brominated derivative bromopromazine. Unexpectedly, we do not find a chlorpromazine molecule in the channel pore of ELIC, but behind the beta 8-beta 9 loop in the extracellular ligand-binding domain. The beta 8-beta 9 loop is localized downstream from the neurotransmitter binding site and plays an important role in coupling of ligand binding to channel opening. In combination with electrophysiological recordings from ELIC cysteine mutants and a thiol-reactive derivative of chlorpromazine, we demonstrate that chlorpromazine binding at the beta 8-beta 9 loop is responsible for receptor inhibition. We further use molecular-dynamics simulations to support the X-ray data and mutagenesis experiments. Together, these data unveil an allosteric binding site in the extracellular ligand-binding domain of ELIC. Our results extend on previous observations and further substantiate our understanding of a multisite model for allosteric modulation of Cys-loop receptors.

  • 561.
    Nyström, Cecilia
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Consequences of Violation of Special Relativity and Causality2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 562.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    A brief status of non-standard neutrino interactions2013In: NOW 2012: Proceedings of the Neutrino Oscillation Workshop / [ed] Paolo Bernardini, Gianluigi Fogli, Eligio Lisi, Elsevier, 2013, p. 301-307Conference paper (Refereed)
    Abstract [en]

    In this plenary talk, we review the status of non-standard neutrino interactions (NSIs). First, we give a brief introduction to neutrino flavor transitions with NSIs based on the standard paradigm of neutrino oscillations. Then, we discuss alternative scenarios for neutrino flavor transitions such as neutrino decoherence, neutrino decay, and NSIs. Second, we investigate NSIs with three neutrino flavors. In general, we introduce production and detection NSIs, including the so-called zero-distance effect, and matter NSIs. In addition, we study mappings and approximate formulas for NSIs. Third, we present a brief account of theoretical models for NSIs. Fourth and most important, we investigate in detail the phenomenology of NSIs based on different types of data from neutrino experiments. Fifth, we give some phenomenological bounds on both matter and production/detection NSIs as well as we present sensitivity and discovery reach of NSIs at future experiments. Finally, we present a summary and state our conclusions.

  • 563.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    After Higgs2012In: New scientist (1971), ISSN 0262-4079, Vol. 215, no 2881, p. 29-29Article in journal (Other (popular science, discussion, etc.))
  • 564.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Another collider is not the way forward2013In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 494, no 7435, p. 35-35Article in journal (Other academic)
  • 565.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Bimaximal fermion mixing from the quark and leptonic mixing matrices2005In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 622, no 02-jan, p. 159-164Article in journal (Refereed)
    Abstract [en]

    In this Letter. we show how the mixing angles of the standard parameterization add when multiplying the quark and leptonic mixing matrices. i.e., we derive explicit sum rules for the quark and leptonic mixing angles. In this connection, we also discuss other recently proposed sum rules for the mixing angles assuming bimaximal fermion mixing. In addition, we find that the present experimental and phenomenological data of the mixing angles naturally fulfill our sum rules, and thus, give rise to bilarge or bimaximal fermion mixing.

  • 566.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Cutting with Occam's razor2012In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 86, no 9, p. 097301-Article in journal (Refereed)
    Abstract [en]

    We comment positively on the recent article "Seesaw mechanism with Occam's razor" [K. Harigaya et al. Phys. Rev. D 86, 013002 (2012).] by Harigaya, Ibe, and Yanagida. In this article, the authors are using the principle of Occam's razor in neutrino physics-a principle that should be applied more often in science in general. At the end, we also discuss the Bayesian method in statistics, in which Occam's razor is naturally built in.

  • 567.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Don't let furore over neutrinos blur results2012In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 485, no 7398, p. 309-309Article in journal (Refereed)
  • 568.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Effects of Non-Standard Interactions in the MINOS Experiment2008In: Neutrino Factories, Superbeams And Betabeams / [ed] Osamu Yasuda, Naba Mondal, Chihiro Ohmori, 2008, p. 213-215Conference paper (Refereed)
    Abstract [en]

    In this talk, we investigate the effects of non-standard interactions (NSI) in the MINOS experiment based on a full three-flavor neutrino oscillation framework simulation. The simulation was performed using the GLoBES software. The results indicate that the allowed region in the sin(2)(2 theta(23))-Delta m(31)(2) plane is extended due to NSI effects, that there is a degeneracy between the leptonic mixing angle theta(13) and the NSI parameter epsilon(e tau), and that MINOS can put a lower upper bound on sin(2)(2 theta(13)) than CHOOZ only for small values of vertical bar epsilon(e tau)vertical bar.

  • 569.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Extrinsic CPT Violation in Neutrino Oscillations2004In: NEUTRINO FACTORIES AND SUPERBEAMS: 5th International Workshop on Neutrino Factories and Superbeams; NuFact 03 / [ed] Adam Para, Fermi National Accelerator Laboratory, American Institute of Physics , 2004, p. 265-268Conference paper (Refereed)
    Abstract [en]

    In this talk, we investigate extrinsic CPT violation in neutrino oscillations in matter with three flavors. Note that extrinsic CPT violation is different from intrinsic CPT violation. Extrinsic CPT violation is one way of quantifying matter effects, whereas intrinsic CPT violation would mean that the CPT invariance theorem is not valid. We present analytical formulas for the extrinsic CPT probability differences and discuss their implications for long-baseline experiments and neutrino factory setups.

  • 570.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Four's a crowd2013In: New scientist (1971), ISSN 0262-4079, Vol. 219, no 2925, p. 32-32Article in journal (Refereed)
  • 571.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    International Linear Collider: Another collider is not the way forward2013In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 494, no 7435Article in journal (Refereed)
  • 572.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    LHC reality check2012In: New scientist (1971), ISSN 0262-4079, Vol. 216, no 2895, p. 36-36Article in journal (Other academic)
  • 573.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Neutrino extras2012In: New scientist (1971), ISSN 0262-4079, Vol. 216, no 2885, p. 31-31Article in journal (Other (popular science, discussion, etc.))
  • 574.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Neutrinos and the hunt for the last mixing angle2012In: Europhysics News, ISSN 0531-7479, Vol. 43, no 4, p. 22-25Article in journal (Refereed)
    Abstract [en]

    In summary, the measurement of Ξ 23 by the Super-Kamiokande experiment resulted in one of the first indications of physics beyond Standard Model, the measurement of Ξ 12 was the first precision measurement in neutrino physics, and the hunt for the value of the third and final mixing angle Ξ 13 was the beginning of the end of the measurements of the mixing angles for the neutrinos, but the beginning of the continuation of measurements of the remaining neutrino parameters.

  • 575.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Neutrinos from Kaluza-Klein Dark Matter Annihilations in the Sun2011In: Physics beyond the Standard Models of Particles, Cosmology and Astrophysics: Proceedings of the Fifth International Conference / [ed] H V Klapdor-Kleingrothaus, I V Krivosheina, R Viollier, World Scientific Publishing , 2011, p. 496-502Conference paper (Refereed)
    Abstract [en]

    In this talk, we compute fluxes of neutrinos from Kaluza–Klein dark matter annihilations in the Sun based on cross-sections from both five- and six-dimensional models. For our numerical calculations, we use WimpSim and DarkSUSY. In addition, we compare our results with the ones derived earlier in the literature.

  • 576.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Neutrinos from WIMP Annihilations2008In: Dark Matter in Astroparticle and Particle Physics - Dark 2007: Proceedings of the 6th International Heidelberg Conference / [ed] Hans Volker Klapdor-Kleingrothaus, Geraint F. Lewis, World Scientific Publishing , 2008, p. 51-59Conference paper (Refereed)
    Abstract [en]

    In this talk, we make an improved analysis on the production of neutrinos coming from WIMP annihilations inside the Sun as well as the Earth. We treat both neutrino interaction and oscillation effects in aconsistent three-flavor framework. Our numerical simulations are performed in an event-based setting, which is useful for both theoretical studies and creating neutrino telescope Monte Carlo simulations. We find that the yield of muon-type neutrinos is enhanced or suppressed depending on the dominant WIMP annihilation channel. In addition, we find that oscillations can significantly affect the neutrino yields from WIMP annihilations in the Sun. Effectively, the neutrino flavors are mixed. Finally, for the Earth, the oscillations have no large impact at energies for the new neutrino telescopes such as IceCube, ANTARES, and NESTOR.

  • 577.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Non-Hermitian neutrino oscillations in matter with PT symmetric Hamiltonians2016In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 113, no 6, article id 61001Article in journal (Refereed)
    Abstract [en]

    We introduce and develop a novel approach to extend the ordinary two-flavor neutrino oscillation formalism in matter using a non-Hermitian PT symmetric effective Hamiltonian. The condition of PT symmetry is weaker and less mathematical than that of hermicity, but more physical, and such an extension of the formalism can give rise to sub-leading effects in neutrino flavor transitions similar to the effects by so-called non-standard neutrino interactions. We derive the necessary conditions for the spectrum of the effective Hamiltonian to be real as well as the mappings between the fundamental and effective parameters. We find that the real spectrum of the effective Hamiltonian will depend on all new fundamental parameters introduced in the non-Hermitian PT symmetric extension of the usual neutrino oscillation formalism and that either i) the spectrum is exact and the effective leptonic mixing must always be maximal or ii) the spectrum is approximate and all new fundamental parameters must be small.

  • 578.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Non-standard neutrino interactions2009In: SIXTH INTERNATIONAL WORKSHOP ON NEUTRINO-NUCLEUS INTERACTIONS IN THE FEW-GEV REGION / [ed] Sanchez F; Sorel M; Alvarez-Ruso L; Cervera A; Vicente-Vacas M, American Institute of Physics , 2009, Vol. 1189, p. 16-23Conference paper (Refereed)
    Abstract [en]

    In this talk, I will review non-standard interactions in neutrino physics, especially I will emphazise the impact of non-standard interactions on neutrino oscillations. First, I will give a brief introduction about non-standard interactions and what they are. Then, I will present what has been performed in the literature, what I have done in the field, and what could be done in the future. Next, I will discuss how important non-standard interactions are for neutrino cross-sections. Finally, I will give a summary of the field.

  • 579.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Preprint servers: Follow arXiv's lead2012In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 489, no 7416, p. 367-Article in journal (Refereed)
  • 580.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Relativistic Quantum Physics: From Advanced Quantum Mechanics to Introductory Quantum Field Theory2011 (ed. 1)Book (Refereed)
    Abstract [en]

    Quantum physics and special relativity theory were two of the greatest breakthroughs in physics during the twentieth century and contributed to paradigm shifts in physics. This book combines these two discoveries to provide a complete description of the fundamentals of relativistic quantum physics, guiding the reader effortlessly from relativistic quantum mechanics to basic quantum field theory. The book gives a thorough and detailed treatment of the subject, beginning with the classification of particles, the Klein–Gordon equation and the Dirac equation. It then moves on to the canonical quantization procedure of the Klein–Gordon, Dirac and electromagnetic fields. Classical Yang–Mills theory, the LSZ formalism, perturbation theory, elementary processes in QED are introduced, and regularization, renormalization and radiative corrections are explored. With exercises scattered through the text and problems at the end of most chapters, the book is ideal for advanced undergraduate and graduate students in theoretical physics.

  • 581.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Searches for hyperbolic extra dimensions at the LHC2008Other (Refereed)
    Abstract [en]

    In this poster, we present a model of large extra dimensions where the internal space has the geometry of a hyperbolic disc. Compared with the ADD model, this model provides a more satisfactory solution to the hierarchy problem between the electroweak scale and the Planck scale, and it also avoids constraints from astrophysics. Since there is no known analytic form of the Kaluza-Klein spectrum for our choice of geometry, we obtain a spectrum based on a combination of approximations and numerical computations. We study the possible signatures of our model for hadron colliders, especially the LHC, where the most important processes are the production of a graviton together with a hadronic jet or a photon. We find that for the case of hadronic jet production, it is possible to obtain relatively strong signals, while for the case of photon production, this is much more difficult.

  • 582.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Status of non-standard neutrino interactions2013In: Reports on progress in physics (Print), ISSN 0034-4885, E-ISSN 1361-6633, Vol. 76, no 4, p. 044201-Article, review/survey (Refereed)
    Abstract [en]

    The phenomenon of neutrino oscillations has been established as the leading mechanism behind neutrino flavor transitions, providing solid experimental evidence that neutrinos are massive and lepton flavors are mixed. Here we review sub-leading effects in neutrino flavor transitions known as non-standard neutrino interactions (NSIs), which is currently the most explored description for effects beyond the standard paradigm of neutrino oscillations. In particular, we report on the phenomenology of NSIs and their experimental and phenomenological bounds as well as an outlook for future sensitivity and discovery reach.

  • 583.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Sterile search2013In: New scientist (1971), ISSN 0262-4079, Vol. 218, no 2913, p. 32-32Article in journal (Refereed)
  • 584.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Testing CPT invariance with neutrinos2002In: Proceedings of ICHEP 2002 / [ed] S. Bentvelsen, P. de Jong, J. Koch, and E. Laenen, Amsterdam: Elsevier Science B.V. , 2002, p. 53-56Conference paper (Refereed)
    Abstract [en]

    We investigate possible tests of CPT invariance on the level of event rates at neutrino factories. We do not assume any specific model, but phenomenological differences in the neutrino-antineutrino masses and mixing angles in a Lorentz invariance preserving context, which could be induced by physics beyond the Standard Model. We especially focus on the muon neutrino and antineutrino disappearance channels in order to obtain constraints on the neutrino-antineutrino mass and mixing angle differences. In a typical neutrino factory setup simulation, we find, for example, that

    .

  • 585.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    T-violating effects in three flavor neutrino oscillations in matter2001In: International Europhysics Conference on High Energy Physics: hep2001 / [ed] Horváth Dezsõ (chairman), Lévai Péter, Patkós András, SISSA , 2001, p. 195-Conference paper (Refereed)
    Abstract [en]

    In this talk, we consider the interplay of fundamental and matter-induced T-violating effects in neutrino oscillations in matter. We present a simple approximative analytical formula for the T-violating probability asymmetry for three flavor neutrino oscillations in matter with an arbitrary density profile. We also discuss some implications of the obtained results. Since there are no T-violating effects in two flavor neutrino case (in the limit of vanshing $\theta_{13}$ or $\Delta m_{21}^2$, the three flavor neutrino oscillations reduces to the two flavor ones), the T-violating probability asymmetry can, in principle, provide a way to measure $\theta_{13}$ and $\Delta m_{21}^2$.

  • 586.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Blennow, MattiasKTH, School of Engineering Sciences (SCI), Theoretical Physics.Badelek, BarbaraEdsjö, JoakimHällgren, TomasKonstandin, ThomasPearce, MarkKTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    The 2nd Scandinavian NeutrinO Workshop2006Conference proceedings (editor) (Refereed)
    Abstract [en]

    The first Scandinavian NeutrinO Workshop (SNOW) was held in Uppsala, Sweden, in February 2001. About five years passed until the next SNOW took place—this time in Stockholm, Sweden between 2 May 2006 and 6 May 2006. The aim of the workshop was to cover a variety of topics in neutrino physics with leading researchers in the field as speakers. The Royal Swedish Academy of Sciences (KVA) awarded SNOW 2006 a grant for inviting such speakers. The workshop was mainly directed towards phenomenology and theory with connections to experiments and gave an opportunity for theorists and experimentalists to work together, discuss the latest results, and combine the different branches of neutrino physics. The different topics discussed were: solar and atmospheric neutrinos, reactor and accelerator neutrinos, neutrinos in astrophysics and cosmology, phenomenology of neutrino data, neutrino oscillations, theory and model building, fundamental properties of neutrinos, neutrinoless double beta decay, and flavor physics.

    Around 70 scientists (spanning from graduate students to world-leading researchers) in the field of neutrino physics participated in SNOW 2006 and 44 talks were presented in plenary sessions. Out of the 44 talks, 37 have been contributed to these proceedings.

    The talks of SNOW 2006 took place in the Oskar Klein Auditorium at the AlbaNova University Center in Stockholm. The AlbaNova University Center is a joint endeavour between the Royal Institute of Technology (KTH) and Stockholm University. The social program included a welcome reception at KVA, an excursion to the Royal Armoury at the Royal Palace in Stockholm as well as a boat trip in the archipelago of Stockholm, a reception at the City Hall of Stockholm arranged by the city, and finally, a workshop dinner at Häringe Castle south of Stockholm.

  • 587.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Popa, Christoph
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Non-unitarity of the leptonic mixing matrix in the TeV-scale type-I seesaw model2010In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 692, no 4, p. 257-260Article in journal (Refereed)
    Abstract [en]

    The non-unitarity effects in leptonic flavor mixing are regarded as one of the generic features of the type-1 seesaw model. Therefore, we explore these effects in the TeV-scale type-1 seesaw model, and show that there exist non-trivial correlations among the non-unitarity parameters, stemming from the typical flavor structure of the low-scale seesaw model. In general, it follows from analytical discussions and numerical results that all the six non-unitarity parameters are related to three model parameters, while the widely studied parameters eta(e tau) and eta(mu tau) cannot be phenomenologically significant simultaneously.

  • 588.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Riad, Stella
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Running of neutrino parameters and the Higgs self-coupling in a six-dimensional UED model2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 718, no 3, p. 1002-1007Article in journal (Refereed)
    Abstract [en]

    We investigate a six-dimensional universal extra-dimensional model in the extension of an effective neutrino mass operator. We derive the β-functions and renormalization group equations for the Yukawa couplings, the Higgs self-coupling, and the effective neutrino mass operator in this model. Especially, we focus on the renormalization group running of physical parameters such as the Higgs self-coupling and the leptonic mixing angles. The recent measurements of the Higgs boson mass by the ATLAS and CMS Collaborations at the LHC as well as the current three-flavor global fits of neutrino oscillation data have been taken into account. We set a bound on the six-dimensional model, using the vacuum stability criterion, that allows five Kaluza-Klein modes only, which leads to a strong limit on the cutoff scale. Furthermore, we find that the leptonic mixing angle θ12 shows the most sizeable running, and that the running of the angles θ13 and θ23 are negligible. Finally, it turns out that the findings in this six-dimensional model are comparable with what is achieved in the corresponding five-dimensional model, but the cutoff scale is significantly smaller, which means that it could be detectable in a closer future.

  • 589.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Schwetz, Thomas
    Zhang, He
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Non-standard neutrino interactions in the Zee-Babu model2009In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 681, no 3, p. 269-275Article in journal (Refereed)
    Abstract [en]

    We investigate non-standard neutrino interactions (NSIs) in the Zee-Babu model. The size of NSIs predicted by this model is obtained from a full scan over the parameter space. taking into account constraints from low-energy experiments such as searches for lepton flavor violation (LFV) and the requirement to obtain a viable neutrino mass matrix. The dependence on the scale of new physics as well as on the type of the neutrino mass hierarchy is discussed. We find that NSIs at the source of a future neutrino factory may be at an observable level in the nu(e) -> nu(tau) and/or nu(mu) -> nu(tau) channels. In particular, if the doubly charged scalar of the model has a mass in reach of the LHC and if the neutrino mass hierarchy is inverted, a highly predictive scenario is obtained with observable signals at the LHC, in upcoming neutrino oscillation experiments, in LFV processes, and for NSIs at a neutrino factory.

  • 590.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Non-standard interaction effects at reactor neutrino experiments2009In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 671, no 1, p. 99-104Article in journal (Refereed)
    Abstract [en]

    We study non-standard interactions (NSIs) at reactor neutrino experiments, and in particular, the mimicking effects on theta(13). We present generic formulas for oscillation probabilities including NSIs from sources and detectors. Instructive mappings between the fundamental leptonic mixing parameters and the effective leptonic mixing parameters are established. In addition, NSI corrections to the mixing angles theta(13) and theta(12) are discussed in detailed. Finally, we show that, even for a vanishing theta(13), all Oscillation phenomenon may still be observed ill future short baseline reactor neutrino experiments, such as Double Chooz and Daya Bay, due to the existences of NSIs.

  • 591.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Effects of nonstandard neutrino interactions at PINGU2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 88, no 1, p. 013001-Article in journal (Refereed)
    Abstract [en]

    Neutrino oscillation experiments in the past decades have greatly improved our knowledge on neutrinos by measuring the fundamental neutrino parameters. The ongoing and upcoming neutrino oscillation experiments are intended to pin down the neutrino mass hierarchy and to discover the leptonic CP violation. By means of neutrino oscillograms, we analyze the impact of nonstandard neutrino interactions on neutrino oscillations in Earth matter. The standard neutrino oscillation probabilities may be significantly changed by nonstandard interaction parameters, and, in particular, the CP-violating effects in the energy range E = 1-20 GeV are greatly enhanced. In addition, the event rates of muon neutrinos in the proposed huge atmospheric neutrino experiment, PINGU at the South Pole, have been estimated in the presence of nonstandard neutrino interactions. It has been found that the PINGU experiment has very good sensitivities to the nonstandard neutrino interaction parameters.

  • 592.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Nonstandard interaction effects on neutrino parameters at medium-baseline reactor antineutrino experiments2014In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 728, p. 148-155Article in journal (Refereed)
    Abstract [en]

    Precision measurements of leptonic mixing parameters and the determination of the neutrino mass hierarchy are the primary goals of the forthcoming medium-baseline reactor antineutrino experiments, such as JUNO and RENO-50. In this work, we investigate the impact of nonstandard neutrino interactions (NSIs) on the measurements of {sin(2) theta(12), Delta m(21)(2)} and {sin(2) theta(13), Delta m(31)(2)}. and on the sensitivity to the neutrino mass hierarchy, at the medium-baseline reactor experiments by assuming a typical experimental setup. It turns out that the true mixing parameter sin(2) theta(12) can be excluded at a more than 3 sigma level if the NSI parameter epsilon(e mu), or epsilon(e tau), is as large as 2% in the most optimistic case. However, the discovery reach of NSI effects has been found to be small, and depends crucially on the CP-violating phases. Finally, we show that NSI effects could enhance or reduce the discrimination power of the JUNO and RENO-50 experiments between the normal and inverted neutrino mass hierarchies.

  • 593.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Probing the leptonic Dirac CP-violating phase in neutrino oscillation experiments2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 87, no 5, p. 053006-Article in journal (Refereed)
    Abstract [en]

    The discovery of leptonic CP violation is one of the primary goals of next-generation neutrino oscillation experiments, which is feasible due to the recent measurement of a relatively large leptonic mixing angle theta(13). We suggest two new working observables Delta A(alpha beta)(m) equivalent to max[A(alpha beta)(CP)(delta) - min[A(alpha beta)(CP)(delta)] and Delta A(alpha beta)(CP)(delta) equivalent to A(alpha beta)(CP)(delta) - A(alpha beta)(CP)(0) to describe the CP-violating effects in long-baseline and atmospheric neutrino oscillation experiments. The former signifies the experimental sensitivity to the leptonic Dirac CP-violating phase delta and can be used to optimize the experimental setup, while the latter measures the intrinsic leptonic CP violation and can be used to extract delta directly from the experimental observations. Both analytical and numerical analyses are carried out to illustrate their main features. It turns out that an intense neutrino beam with sub-GeV energies and a baseline of a few 100 km may serve as an optimal experimental setup for probing leptonic CP violation.

  • 594.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Radiative corrections to the leptonic Dirac CP-violating phase2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 87, no 1, p. 013012-Article in journal (Refereed)
    Abstract [en]

    Since the smallest leptonic mixing angle theta(13) has been measured to be relatively large, it is quite promising to constrain or determine the leptonic Dirac CP-violating phase delta in future neutrino oscillation experiments. Given some typical values of delta = pi/2, pi, and 3 pi/2 at the low energy scale, as well as current experimental results of the other neutrino parameters, we perform a systematic study of radiative corrections to delta by using the one-loop renormalization group equations in the minimal supersymmetric standard model and the universal extra-dimensional model. It turns out that delta is rather stable against radiative corrections in both models, except for the minimal supersymmetric standard model with a very large value of tan beta. Both cases of Majorana and Dirac neutrinos are discussed. In addition, we use the preliminary indication of delta = (1.08(-0.31)(+0.28))pi or delta = (1.67(-0.77)(+0.37))pi from the latest global-fit analyses of data from neutrino oscillation experiments to illustrate how it will be modified by radiative corrections.

  • 595.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Extrinsic and intrinsic CPT asymmetries in neutrino oscillations2015In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 893, p. 482-500Article in journal (Refereed)
    Abstract [en]

    We reconsider the extrinsic and possible intrinsic CPT violation in neutrino oscillations, and point out an identity, i.e., A(alpha beta)(CP) = A(beta alpha)(CPT) + A(alpha beta)(T), among the CP, T, and CPT asymmetries in oscillations. For three-flavor oscillations in matter of constant density, the extrinsic CPT asymmetries A(ee)(CPT), A(e mu)(CPT), A(mu e)(CPT), and A(mu mu)(CPT) caused by Earth matter effects have been calculated in the plane of different neutrino energies and baseline lengths. It is found that two analytical conditions can be implemented to describe the main structure of the contours of vanishing extrinsic CPT asymmetries. Finally, without assuming intrinsic CPT symmetry in the neutrino sector, we investigate the possibility to constrain the difference of the neutrino CF-violating phase and the antineutrino one (delta) over bar using a low-energy neutrino factory and the super-beam experiment ESS nu SB. We find that \delta - (delta) over bar\ less than or similar to 0.35 pi in the former case and \delta - (delta) over bar\ less than or similar to 0.7 pi in the latter case can be achieved at the 3 sigma confidence level if delta = (delta) over bar = pi/2 is assumed.

  • 596.
    Ohlsson, Tommy
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics. Chinese Acad Sci,China.
    Renormalization group running of neutrino parameters2014In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, p. 5153-Article, review/survey (Refereed)
    Abstract [en]

    Neutrinos are the most elusive particles in our Universe. They have masses at least one million times smaller than the electron mass, carry no electric charge and very weakly interact with other particles, meaning that they are rarely captured in terrestrial detectors. Tremendous efforts in the past two decades have revealed that neutrinos can transform from one type to another as a consequence of neutrino oscillations-a quantum mechanical effect over macroscopic distances-yet the origin of neutrino masses remains puzzling. The physical evolution of neutrino parameters with respect to energy scale may help elucidate the mechanism for their mass generation.

  • 597.
    Ollila, O H Samuli
    et al.
    Tampere University of Technology.
    Risselada, H Jelger
    University of Groningen.
    Louhivuori, Martti
    University of Groningen.
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Vattulainen, Ilpo
    Tampere University of Technology,.
    Marrink, Siewert J
    University of Groningen.
    3D pressure field in lipid membranes and membrane-protein complexes2009In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, no 7, p. 078101-Article in journal (Refereed)
    Abstract [en]

    We calculate full 3D pressure fields for inhomogeneous nanoscale systems using molecular dynamics simulation data. The fields represent systems with increasing level of complexity, ranging from semivesicles and vesicles to membranes characterized by coexistence of two phases, including also a protein-membrane complex. We show that the 3D pressure field is distinctly different for curved and planar bilayers, the pressure field depends strongly on the phase of the membrane, and that an integral protein modulates the tension and elastic properties of the membrane.

  • 598. Olsen, Richard W.
    et al.
    Li, Guo-Dong
    Wallner, Martin
    Trudell, James R.
    Bertaccini, Edward J.
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Miller, Keith W.
    Alkana, Ronald L.
    Davies, Daryl L.
    Structural Models of Ligand-Gated Ion Channels: Sites of Action for Anesthetics and Ethanol2014In: Alcoholism: Clinical and Experimental Research, ISSN 0145-6008, E-ISSN 1530-0277, Vol. 38, no 3, p. 595-603Article in journal (Refereed)
    Abstract [en]

    The molecular mechanism(s) of action of anesthetic, and especially, intoxicating doses of alcohol (ethanol [EtOH]) have been of interest even before the advent of the Research Society on Alcoholism. Recent physiological, genetic, and biochemical studies have pin-pointed molecular targets for anesthetics and EtOH in the brain as ligand-gated ion channel (LGIC) membrane proteins, especially the pentameric (5 subunit) Cys-loop superfamily of neurotransmitter receptors including nicotinic acetylcholine (nAChRs), GABA(A) (GABA(A)Rs), and glycine receptors (GlyRs). The ability to demonstrate molecular and structural elements of these proteins critical for the behavioral effects of these drugs on animals and humans provides convincing evidence for their role in the drugs' actions. Amino acid residues necessary for pharmacologically relevant allosteric modulation of LGIC function by anesthetics and EtOH have been identified in these channel proteins. Site-directed mutagenesis revealed potential allosteric modulatory sites in both the trans-membrane domain (TMD) and extracellular domain (ECD). Potential sites of action and binding have been deduced from homology modeling of other LGICs with structures known from crystallography and cryo-electron microscopy studies. Direct information about ligand binding in the TMD has been obtained by photoaffinity labeling, especially in GABA(A)Rs. Recent structural information from crystallized procaryotic (ELIC and GLIC) and eukaryotic (GluCl) LGICs allows refinement of the structural models including evaluation of possible sites of EtOH action.

  • 599. Orellana, Laura
    et al.
    Yoluk, Özge
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Carrillo, Oliver
    Orozco, Modesto
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Prediction and Validation of Protein Intermediate States from Structurally Rich Ensembles and Coarse-Grained Simulations2016In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 7Article in journal (Refereed)
    Abstract [en]

    Protein conformational changes are at the heart of cell functions, from signaling to ion transport. However, the transient nature of the intermediates along transition pathways hampers their experimental detection, making the underlying mechanisms elusive. Here, we retrieve dynamic information on the actual transition routes from Principal Component Analysis (PCA) of structurally-rich ensembles and, in combination with coarse-grained simulations, explore the conformational landscapes of five well-studied proteins. Modeling them as elastic networks in a hybrid Elastic-Network Brownian Dynamics simulation (eBDIMS), we generate trajectories connecting stable end-states that spontaneously sample the crystallographic motions, predicting the structures of known intermediates along thepaths. We also show that the explored non-linear routes can delimit the lowest energy passages between end-states sampled by atomistic molecular dynamics. The integrative methodology presented here provides a powerful framework to extract and expand dynamic pathway information from the Protein Data Bank, as well as to validate sampling methods in general. 

  • 600.
    Palm, Oskar
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Bacterial growth models2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this thesis the growth patterns of certain bacterial colonies are studied through numerical simulations of a continuous model, describing the growth of the colony. The objective was to construct a mathematical model capable of recreating observed growth patterns and thus try to gain some insight into the dynamics of bacterial growth. The model constructed in this thesis consists of a set of reaction-diffusion equations describing the evolution of the bacterial colony viewed as a continuous body rather than many individual bacteria. This approach was partially successful, in the sense that similar patterns to those observed in experiments were indeed observed in the simulations. On the other hand, the model was found inadequate in the sense that it could not satisfactory account for the initial rapid expansion of the colony in combination with the fact that the expansion is severely diminished after a few days. From the results it could be concluded that in order to get a satisfactory description of the complete evolution of the bacterial colonies studied here a more sophisticated theory for the diffusion processes is needed. The main conclusion is that the changes in the growth patterns are most likely due to genetic changes, or ’mutations’, in some bacteria causing the mutated bacteria to diffuse faster. There is an upper bound for the mutation frequency in order to get the patterns seen in experiments. The biological mechanism behind this phenomenon could be that the bacteria that mutate lose their pili enabling them to diffuse faster.

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