TNT Colloquium Hydrodynamic fluctuations and chiral corrections to transport coefficient[Duke]

Tuesday, January 15, 2019 - 3:30pm

Derek Teaney (Stony Brook University)

First, I review hydrodynamic fluctuations and why theyare important to the search for the QCD critical point. I discusshow stochastic hydrodynamics leads (though loops) to longtime tails which appear to the 1.5 order in the gradient expansion.Subsequently, I use this knowledge to discuss hydrodynamics in approximatelythe chiral limit (below the critical temperate), where the appropriate effective theory is a non-abelian generalizationof superfluid hydrodynamics. This hydrodynamic theory is corrected by the pion mass, and therefore approaches ordinary hydrodynamics in the very long wavelengthlimit. Integrating out the superfluid modes, in analogy to the long time tails, yields thefirst correction from a finite quark mass to the bulk viscosity of QCD. This correctionis proportional to the 0.5 order in the quark mass .

Physics 298

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