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

Huot, Simon C.; Jeon, Sangyong; Moore, Guy D.

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

Authors

Huot, Simon C.

Jeon, Sangyong

Moore, Guy D.

Description

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