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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.
    Balatsky, Alexander
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Gudnason, Sven Bjarke
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Kedem, Yaron
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Krikun, Alexander
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Zarembo, Konstantin
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Classical and quantum temperature fluctuations via holography2015In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 1, article id 011Article in journal (Refereed)
    Abstract [en]

    We study local temperature fluctuations in a 2+1 dimensional CFT on the sphere, dual to a black hole in asymptotically AdS spacetime. The fluctuation spectrum is governed by the lowest-lying hydrodynamic modes of the system whose frequency and damping rate determine whether temperature fluctuations are thermal or quantum. We calculate numerically the corresponding quasinormal frequencies and match the result with the hydrodynamics of the dual CFT at high temperature. As a by-product of our analysis we determine the appropriate boundary conditions for calculating low-lying quasinormal modes for a four-dimensional Reissner-Nordstrom black hole in global AdS.

  • 3. Fonda, Piermarco
    et al.
    Franti, Lasse
    Keraenen, Ville
    Keski-Vakkuri, Esko
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Sweden.
    Tonni, Erik
    Holographic thermalization with Lifshitz scaling and hyperscaling violation2014In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 8, p. 051-Article in journal (Refereed)
    Abstract [en]

    A Vaidya type geometry describing gravitation collapse in asymptotically Lifshitz spacetime with hyperscaling violation provides a simple holographic model for thermalization near a quantum critical point with non-trivial dynamic and hyperscaling violation exponents. The allowed parameter regions are constrained by requiring that the matter energy momentum tensor satisfies the null energy condition. We present a combination of analytic and numerical results on the time evolution of holographic entanglement entropy in such backgrounds for different shaped boundary regions and study various scaling regimes, generalizing previous work by Liu and Suh.

  • 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.

  • 5. Larjo, Klaus
    et al.
    Lowe, David A.
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Black holes without firewalls2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 87, no 10, p. 104018-Article in journal (Refereed)
    Abstract [en]

    The postulates of black hole complementarity do not imply a firewall for infalling observers at a black hole horizon. The dynamics of the stretched horizon, that scrambles and reemits information, determines whether infalling observers experience anything out of the ordinary when entering a large black hole. In particular, there is no firewall if the stretched horizon degrees of freedom retain information for a time of the order of the black hole scrambling time.

  • 6. Lowe, David A.
    et al.
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
    Black hole complementarity: The inside view2014In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 737, p. 320-324Article in journal (Refereed)
    Abstract [en]

    Within the framework of black hole complementarity, a proposal is made for an approximate interior effective field theory description. For generic correlators of local operators on generic black hole states, it agrees with the exact exterior description in a region of overlapping validity, up to corrections that are too small to be measured by typical infalling observers.

  • 7. Lowe, David A.
    et al.
    Thorlacius, Larus
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Pure states and black hole complementarity2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 88, no 4, p. 044012-Article in journal (Refereed)
    Abstract [en]

    The future apparent horizon of a black hole develops large stress energy due to quantum effects, unless the outgoing modes are in a thermal density matrix at the local Hawking temperature. It is shown for generic pure states that the deviation from thermality is so small that infalling observers will see no drama on their way to the stretched horizon, providing a derivation of black hole complementarity after the Page time. Atypical pure states, and atypical observers, may of course see surprises, but that is not surprising.

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