On Eling-Oz formula for the holographic bulk viscosity

Details On Eling-Oz formula for the holographic bulk viscosity On Eling-Oz formula for the holographic bulk viscosity

2011-03-19

arxiv.org/abs/1103.3733v2

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, 4 figures; v2: references updated

Scientific paper

Recently Eling and Oz [1] proposed a simple formula for the bulk viscosity of holographic plasma. They argued that the formula is valid in the high temperature (near-conformal) regime, but is expected to break down at low temperatures. We point out that the formula is in perfect agreement with the previous computations of the bulk viscosity of the cascading plasma [2,3], as well as with the previous computations of the bulk viscosity of N=2^* plasma [4,5]. In the latter case it correctly reproduces the critical behaviour of the bulk viscosity in the vicinity of the critical point with the vanishing speed of sound.

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