Bulk viscosity of strongly coupled plasmas with holographic duals

Details Bulk viscosity of strongly coupled plasmas with holographic duals Bulk viscosity of strongly coupled plasmas with holographic duals

2008-06-02

arxiv.org/abs/0806.0407v1

JHEP 0808:085,2008

Physics

High Energy Physics

High Energy Physics - Theory

33 pages, 3 figures

Scientific paper

10.1088/1126-6708/2008/08/085

We explain a method for computing the bulk viscosity of strongly coupled thermal plasmas dual to supergravity backgrounds supported by one scalar field. Whereas earlier investigations required the computation of the leading dissipative term in the dispersion relation for sound waves, our method requires only the leading frequency dependence of an appropriate Green's function in the low-frequency limit. With a scalar potential chosen to mimic the equation of state of QCD, we observe a slight violation of the lower bound on the ratio of the bulk and shear viscosities conjectured in arXiv:0708.3459.

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