Comment on "Viscous hydrodynamics relaxation time from AdS/CFT correspondence"
Abstract
This is a comment to hep-th/0703243. The paper determined the relaxation time taupi of the shear viscous stress for the N=4 SYM from AdS/CFT correspondence. The purpose of this comment is to point out that the value of taupi is 3 times larger than their result if one takes into account an additional term in the hydrodynamic equation.
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