Shear viscosity in weakly coupled ${\cal N} {=} 4$ Super Yang-Mills theory compared to QCD

Details Shear viscosity in weakly coupled ${\cal N} {=} 4$ Super Yang-Mills theory compared to QCD Shear viscosity in weakly coupled ${\cal N} {=} 4$ Super Yang-Mills theory compared to QCD

2006-08-04

arxiv.org/abs/hep-ph/0608062v2

Phys.Rev.Lett.98:172303,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages with 3 figures. References are corrected and minor changes are made. Conclusions unchanged

Scientific paper

10.1103/PhysRevLett.98.172303

We compute the shear viscosity of weakly coupled N=4 supersymmetric Yang-Mills (SYM) theory. Our result for [eta/s], the viscosity to entropy-density ratio, is many times smaller than the corresponding weak-coupling result in QCD. This suggests that [eta/s] of QCD near the transition point is several times larger than the viscosity bound, [eta/s] >= 1/4 pi.

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