Constraining the bulk viscosity of Quantum Chromodynamics with heavy ion collisions

Friday, July 21, 2017 - 10:30am

ean-Francois Paquet (Stonybrook University)

The bulk viscosity of a weakly-coupled quark-gluon plasma is expected to be small. On the other hand, for the strongly-coupled quark-gluon plasma produced in heavy ion collisions at the RHIC and the LHC, bulk viscosity could in principle be significant. There are theoretical evidence that the bulk viscosity of QCD might peak in the cross-over region, and hydrodynamic studies of heavy ion collisions have shown that soft hadron measurements are sensitive to such a peak in bulk viscosity. In this talk, I will discuss probabilistic constraints on the bulk viscosity of QCD obtained by comparing a modern hydrodynamic model of heavy ion collisions to hadronic data using Bayesian statistical methods

Physics 298

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