Beyond eta/s = 1/4pi

Details Beyond eta/s = 1/4pi Beyond eta/s = 1/4pi

2008-12-14

arxiv.org/abs/0812.2521v3

JHEP 0903:084,2009

Physics

High Energy Physics

High Energy Physics - Theory

44 pages, v2: Minor changes to numerics in section 4, references added, v3: published version

Scientific paper

10.1088/1126-6708/2009/03/084

We use low-energy effective description of gauge theory/string theory duality to argue that the Kovtun-Son-Starinets viscosity bound is generically violated in superconformal gauge theories with non-equal central charges $c\ne a$. We present new examples (of string theory constructions and of gauge theories) where the bound is violated in a controllable setting. We consider the comparison of results from AdS/CFT calculations to the QCD plasma in the context of this discussion.

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