Physics PAN Seminar by Prof. Rainer J Fries (Texas A&M University)

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Date: February 5, 2021
Time: 3:30 p.m. - 4:30 p.m.
Location: ZOOM
Category: Seminar

Physics PAN Seminar by Prof. Rainer J Fries (Texas A&M University)

Title: Constraining the Effective Shear Viscosity of Hot Hadron Matter

Abstract:

Transport properties of exotic QCD matter have received much attention since it was discovered that very low shear viscosity-over-entropy ratios eta/s are realized in quark gluon plasma just above the pseudo-critical temperature Tc that separates this phase from hot hadron matter. Both theoretical calculations and estimates from data collected in high-energy nuclear collisions have indicated values of eta/s close to the conjectured lower bound, implying that quark gluon plasma is an almost perfect liquid. Moving our attention below Tc, the transport properties of hot hadron matter are less clear. Theoretical predictions differ by an order of magnitude. We argue that constraints on hadronic eta/s can be derived from the same high-energy nuclear data sets, if the deviations of final freeze-out particle distributions from thermal equilibrium are analyzed. In this talk we describe our method, our attempts to quantify uncertainties, our final results, and the remaining open questions.

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