Hydrodynamics from the Dp-brane
2007; Springer Nature; Volume: 2007; Issue: 05 Linguagem: Inglês
10.1088/1126-6708/2007/05/036
ISSN1127-2236
Autores Tópico(s)Galaxies: Formation, Evolution, Phenomena
ResumoWe compute the shear viscosity η, the bulk viscosity ζ, and the speed of sound vs for theories dual to the near horizon geometries that arise from a stack of black Dp-branes for p = 2, ..., 6 in the decoupling limit. The main new result is the bulk viscosity which, for all p, is found to be related to the speed of sound by the simple relation ζ/η = −2(vs2−1/p). For completeness the shear viscosity is rederived from gravitational perturbations in the shear and scalar channels. We comment on technical issues like the counterterms needed, or the possible dependence on the conformal frame.
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