The viscosity bound in string theory

Details The viscosity bound in string theory The viscosity bound in string theory

2009-07-27

arxiv.org/abs/0907.4798v2

Nucl.Phys.A830:295c-298c,2009

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee

Scientific paper

10.1016/j.nuclphysa.2009.09.028

The ratio of shear viscosity to entropy density $\eta/s$ of any material in nature has been conjectured to have a lower bound of $1/4\pi$, the famous KSS bound. We examine string theory models for evidence in favour of and against this conjecture. We show that in a broad class of models quantum corrections yield values of $\eta/s$ just above the KSS bound. However, incorporating matter fields in the fundamental representation typically leads to violations of this bound. We also outline a program to extend AdS/CFT methods to RHIC phenomenology.

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