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  • 1. Balasubramanian, V.
    et al.
    Bernamonti, A.
    Craps, B.
    Keränen, Ville
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Keski-Vakkuri, E.
    Mueller, B.
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Vanhoof, J.
    Thermalization of the spectral function in strongly coupled two dimensional conformal field theories2013In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 4, p. 069-Article in journal (Refereed)
    Abstract [en]

    Using Wigner transforms of Green functions, we discuss non-equilibrium generalizations of spectral functions and occupation numbers. We develop methods for computing time-dependent spectral functions in conformal field theories holographically dual to thin-shell AdS-Vaidya spacetimes.

  • 2.
    Keränen, Ville
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Nonequilibrium Wilson loops in N=4 super Yang-Mills theory2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 88, no 10, p. 105022-Article in journal (Refereed)
    Abstract [en]

    We consider rectangular Wilson loops in certain nonequilibrium quantum states in N = 4 super Yang-Mills theory at weak coupling, prepared with a quantum quench. We find that in the ladder approximation, the Bethe-Salpeter equation can be reduced to solving a massive 1 + 1 dimensional wave equation with a leaking boundary condition leading to a quasinormal behavior analogous to what is found in studying dynamics of fields in black hole backgrounds. Furthermore, we find that the Wilson loops with size L approach a thermal form after time T approximate to L/2. The thermal form found in the current paper follows from the particular initial state chosen.

  • 3.
    Keränen, Ville
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Thorlacius, L.
    Holographic geometries for condensed matter applications2015In: The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012, World Scientific , 2015, no 210699, p. 902-921Conference paper (Refereed)
    Abstract [en]

    Holographic modeling of strongly correlated many-body systems motivates the study of novel spacetime geometries where the scaling behavior of quantum critical systems is encoded into spacetime symmetries. Einstein-Dilaton-Maxwell theory has planar black brane solutions that exhibit Lifshitz scaling and in some cases hyperscaling violation. Entanglement entropy and Wilson loops in the dual field theory are studied by inserting simple geometric probes involving minimal surfaces into the black brane geometry. Coupling to background matter fields leads to interesting low-energy behavior in holographic models, such as U(1) symmetry breaking and emergent Lifshitz scaling.

  • 4.
    Keränen, Ville
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Thermal correlators in holographic models with Lifshitz scaling2012In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 29, no 19, p. 194009-Article in journal (Refereed)
    Abstract [en]

    We study finite temperature effects in two distinct holographic models that exhibit Lifshitz scaling, looking to identify model independent features in the dual strong coupling physics. We consider the thermodynamics of black branes and find different low-temperature behavior of the specific heat. Deformation away from criticality leads to non-trivial temperature dependence of correlation functions and we study how the characteristic length scale in the two point function of scalar operators varies as a function of temperature and deformation parameters.

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