A sticky business: the status of the conjectured viscosity/entropy density bound

Details A sticky business: the status of the conjectured viscosity/entropy density bound A sticky business: the status of the conjectured viscosity/entropy density bound

2007-08-30

arxiv.org/abs/0708.4201v2

JHEP 0802:026,2008

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, 4 figures, added references, corrected typos, added subsection in response to Son's comments in arXiv:0709.4651

Scientific paper

10.1088/1126-6708/2008/02/026

There have been a number of forms of a conjecture that there is a universal lower bound on the ratio, eta/s, of the shear viscosity, eta, to entropy density, s, with several different domains of validity. We examine the various forms of the conjecture. We argue that a number of variants of the conjecture are not viable due to the existence of theoretically consistent counterexamples. We also note that much of the evidence in favor of a bound does not apply to the variants which have not yet been ruled out.

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