Physics PAN Seminar by Dr. Jasmine Therese Brewer (CERN)

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Date: March 19, 2021
Time: 3:30 p.m. - 4:30 p.m.
Location: ZOOM
Category: Seminar

Physics PAN Seminar by Dr. Jasmine Therese Brewer (CERN)

Title: Slow modes in the rapidly-expanding quark–gluon plasma

Abstract: A crucial question in understanding the onset of hydrodynamic behavior in the quark–gluon plasma is whether hydrodynamics is “unreasonably effective” in describing systems far-from-equilibrium. This is motivated by the observation that many models of expanding systems exhibit an apparent simplification in their description while gradients are large and hydrodynamics is not expected to apply. We provide a new conceptual approach to understanding this simplification based on far-from-equilibrium slow modes. For a class of collision integrals in kinetic theory, these slow modes can be explicitly identified as the instantaneous ground states of an effective Hamiltonian describing the evolution of moments of the distribution function. They are qualitatively distinct from hydrodynamic modes when the system is far from equilibrium, suggesting that the simplification is not directly related to the onset of hydrodynamics. Importantly, these slow modes dominate the evolution when gradients are small compared to the energy gap, which occurs both at early times and in the hydrodynamic limit.

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Meeting ID: 545 664 8463
Passcode: 810058
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March 2021