Speaker
Description
Universality is omnipresent when certain classes of microscopic theories are coarse-grained into effective macroscopic descriptions. Hydrodynamic theories are such macroscopic descriptions in long-wavelength, low-frequency limits of many quantum field theories. On the phenomenological side, hydrodynamics not only serves as a successful macroscopic description of the Quark-gluon plasma (QGP) in relativistic heavy-ion collisions (HICs) but also serves as the energy deposition bin of hard probes such as jets and heavy quarks. It is important to understand to what extent the propagation of the deposited energy can be described within hydrodynamics. We investigate the universality and validity of hydrodynamic theory by studying the propagation of energy-momentum perturbations in kinetic theories from microscopic to macroscopic scales. By comparing results for different microscopic theories, we find a remarkable degree of universality, where the evolution of energy-momentum perturbations of the QGP is rather well described by a pair of sound and nonhydrodynamic modes. We also discuss the future perspectives in hydrodynamic theories that one may explore based on these findings.
| Category | Theory |
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