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arXiv · 1708.02252

Quasi-normal modes of a strongly coupled non-conformal plasma and approach to criticality

Panagiotis Betzios·Umut Gürsoy·Matti Järvinen·Giuseppe Policastro
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Abstract

We study fluctuations around equilibrium in a class of strongly interacting non-conformal plasmas using holographic techniques. In particular we calculate the quasi-normal mode spectrum of black hole backgrounds that approach to Chamblin-Reall plasmas in the IR. In a specific limit, related to the exact linear-dilaton background in string theory, we observe that the plasma approaches criticality and we obtain the quasi-normal spectrum analytically. We regulate the critical limit by gluing the IR geometry that corresponds to the non-conformal plasma to a part of AdS space-time in the UV. Near criticality, we find two sets of quasi-normal modes, related to the IR and UV parts of the geometry. In the critical limit, the quasi-normal modes accumulate to form a branch cut in the correlators of the energy-momentum tensor on the real axis of the complex frequency plane.

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Panagiotis Betzios, Umut Gürsoy, Matti Järvinen, Giuseppe Policastro. 2017-08-07. Quasi-normal modes of a strongly coupled non-conformal plasma and approach to criticality. https://doi.org/10.1103/physrevd.97.081901

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