Universal relaxation in quark-gluon plasma at strong coupling

Alex Buchel, Andrew Day
2015 Physical Review D  
We use top-down gauge theory/string theory correspondence to compute relaxation rates in strongly coupled nonconformal gauge theory plasma. We compare models with difference mechanisms of breaking the scale invariance: "hard breaking" (by relevant operators) and "soft breaking" (by marginal operators). We find that the thermalization time of the transverse traceless fluctuations of the stress-energy tensor is rather insensitive to the mechanisms of breaking the scale invariance over a large
more » ... e of the scale-breaking parameter $\delta=\frac 13-c_s^2$. We comment on the relevance of the results to QCD quark-gluon plasma.
doi:10.1103/physrevd.92.026009 fatcat:y7chskx7ijddnfwcqa4sfa5xe4