Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 10, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP10(2016)155
Keywords
Gauge-gravity correspondence; Holography and quark-gluon plasmas; Quark-Gluon; Plasma
Categories
Funding
- Marie Skodowska-Curie Individual Fellowship of the European Commission's Horizon Programme [658574 FastTh]
- Ramon y Cajal fellowship
- Marie Curie Career Integration Grant [FP7-PEOPLE-2012-GIG-333786]
- Spanish MINECO [FPA2013-40360-ERC]
- Spanish Ministry of Science and Innovation, MICINN [AYA-2010-15709]
- Spanish Ministry of Economy and Competitivity of Spain, MINECO [ESP2013-47637-P]
- MINECO [BES-2012-057909]
- ERC [HoloLHC-306605]
- [MEC FPA2013-46570-C2-1-P]
- [MEC FPA2013-46570-C2-2-P]
- [MDM-2014-0369 of ICCUB]
- [2014-SGR-104]
- [2014-SGR-1474]
- [CPAN CSD2007-00042 Consolider-Ingenio]
- STFC [ST/L000474/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000474/1] Funding Source: researchfish
- ICREA Funding Source: Custom
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We study the equilibrium and near-equilibrium properties of a holographic five-dimensional model consisting of Einstein gravity coupled to a scalar field with a non-trivial potential. The dual four-dimensional gauge theory is not conformal and, at zero temperature, exhibits a renormalisation group flow between two different fixed points. We quantify the deviations from conformality both in terms of thermodynamic observables and in terms of the bulk viscosity of the theory. The ratio of bulk over shear viscosity violates Buchel's bound. We study relaxation of small-amplitude, homogeneous perturbations by computing the quasi-normal modes of the system at zero spatial momentum. In this approximation we identify two different relaxation channels. At high temperatures, the different pressures first become approximately equal to one another, and subsequently this average pressure evolves towards the equilibrium value dictated by the equation of state. At low temperatures, the average pressure first evolves towards the equilibrium pressure, and only later the different pressures become approximately equal to one another.
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