Physics PAN Seminar by Prof. Dr. Jean-Yves Ollitrault (Institut de Physique Théorique, CEA Saclay)

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Date: April 30, 2021
Time: 3:30 p.m. - 4:30 p.m.
Location: Virtual event
Category: Seminar

Physics PAN Seminar by Prof. Dr. Jean-Yves Ollitrault (Institut de Physique Théorique, CEA Saclay)

Title: Effective viscosities for anisotropic flow

Abstract: Determining the transport coefficients of the quark-gluon plasma, such as its shear (η) and bulk (ζ) viscosities, is one of the goals of heavy-ion physics. An important question is how their temperature dependence can be constrained using experimental data. The observable that is most sensitive to the viscosity is anisotropic flow. I show that in relativistic hydrodynamics, the damping of elliptic and triangular flows is determined by an effective viscosity, which is independent of the system size and centrality. This in turn means that this effective viscosity is the only quantity that can be extracted from data at a given collision energy. It is the sum of effective shear and bulk viscosities, each of which is a weighted average of the temperature-dependent viscosity. The effective shear viscosity is driven by the lowest temperatures, just above freeze-out, while the effective bulk viscosity is driven by somewhat higher temperatures.

This talk is based on https://arxiv.org/abs/2010.11919 (to appear in Phys. Rev. C), in collaboration with Fernando Gardim.

Recording: https://wayne-edu.zoom.us/rec/share/C0v9x__r19PnJK0C07-BM9hlA0BxXv9zUKNQRLOoGBL04-wjB3V92cEs87wFzVk.uSjcWu9rJrbAH7za

Slides:https://waynestateprod-my.sharepoint.com/:b:/g/personal/gx1689_wayne_edu/ERRKaueZ-Q9DqmZHlzy3FNsBSHH-FI_YJvtpvFgtVoxKxg?e=hbilUs

Join Zoom Meeting:
https://wayne-edu.zoom.us/j/5456648463?pwd=bXM5bGhCMndiMmt3UzdqQ0FRNjlRdz09

Meeting ID: 545 664 8463
Passcode: 810058

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