Bulletin of the American Physical Society
2020 Fall Meeting of the APS Division of Nuclear Physics
Volume 65, Number 12
Thursday–Sunday, October 29–November 1 2020; Time Zone: Central Time, USA
Session KA: Thermalization from small to large systems |
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Chair: Derek Teaney, Stony Brook University |
Saturday, October 31, 2020 8:30AM - 9:06AM |
KA.00001: Thermalization in QCD: theoretical approaches, phenomenological applications, and interdisciplinary connections Invited Speaker: Raju Venugopalan Heavy-ion collisions at BNL’s Relativistic Heavy-Ion Collider (RHIC) and CERN’s Large Hadron Collider (LHC) provide strong evidence for the formation of a quark-gluon plasma, with tempera- tures extracted from relativistic viscous hydrodynamic simulations shown to be well above the tran- sition temperature from hadron matter. How the strongly correlated quark-gluon matter forms in a heavy-ion collision, its properties off-equilibrium, and the thermalization process in the plasma, are outstanding problems in QCD. We review here the theoretical progress in this field in weak coupling QCD effective field theories and in strong coupling holographic approaches based on gauge-gravity duality. We outline the interdisciplinary connections of different stages of the thermalization process to non-equilibrium dynamics in other systems across energy scales ranging from inflationary cos- mology, to strong field QED, to ultracold atomic gases, with emphasis on the universal dynamics of non-thermal and of hydrodynamic attractors. We survey measurements in heavy-ion collisions that are sensitive to the early non-equilibrium stages of the collision and discuss the potential for future measurements. We summarize the current state-of-the art in thermalization studies and identify promising avenues for further progress. [Preview Abstract] |
Saturday, October 31, 2020 9:06AM - 9:42AM |
KA.00002: Deconstructing Relativistic Hydrodynamics Invited Speaker: Jorge Noronha Despite its success, it remains unclear why relativistic hydrodynamics is applicable in heavy-ion collisions given that local deviations from equilibrium can be very large, especially at early times. In fact, the state-of-the-art hydrodynamic modeling of the quark-gluon plasma is based on Israel-Stewart models of viscous fluid dynamics, whose general behavior in the far-from-equilibrium regime is unknown. In this talk, I review the current understanding of such models and present~new fundamental constraints on the magnitude of viscous corrections in such theories, which can be especially relevant for small systems. These constraints, in particular, suggest the need of alternative viscous fluid formulations that do not follow Israel and Stewart's approach. With this goal, I present a new formulation of viscous fluid dynamics is presented in terms of a controlled~derivative expansion of suitably defined out of equilibrium local temperature, fluid velocity, and chemical potential variables which is proven to be causal, stable, and has less degrees of freedom and free parameters than Israel-Stewart models. ~~ [Preview Abstract] |
Saturday, October 31, 2020 9:42AM - 10:18AM |
KA.00003: An Experimental Perspective on Thermalization in Heavy-Ion Collisions Invited Speaker: Anne Sickles Understanding how the quark-gluon plasma (QGP) is formed from the incoming nuclei in heavy-ion collisions and to what degree it is thermalized are central questions in heavy-ion physics. The QGP is thought to form very quickly in collisions of large nuclei at RHIC and the LHC, based on comparing measurements of azimuthal anisotropies to hydrodynamic calculations. Key related experimental information sensitive to these questions come from small collision systems (pA, pp, etc) and jet quenching. In this talk, we discuss some of the experimental insights and discuss future measurements. [Preview Abstract] |
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