• Corpus ID: 251252988

Does quark-gluon plasma feature an extended hydrodynamic regime?

@inproceedings{Ke2022DoesQP,
  title={Does quark-gluon plasma feature an extended hydrodynamic regime?},
  author={Weiyao Ke and Yi Yin},
  year={2022}
}

• W. Ke, Y. Yin
• Published 1 August 2022
• Physics

We investigate the response of the near-equilibrium quark-gluon plasma (QGP) to perturbation at non-hydrodynamic gradients. We propose a conceivable scenario under which sound mode continues to dominate the medium response in this regime. Such a scenario has been observed experimentally for various liquids and liquid metals. We further show this extended hydrodynamic regime (EHR) indeed exists for both the weakly-coupled kinetic equation in the relaxation time approximation (RTA) and the strongly-coupled N = 4 supersymmetric Yang-Mills (SYM) theory. We construct a simple but nontrivial extension of M¨ueller-Isareal-Stewart (MIS) theory, namely MIS*, and demonstrate that it describes EHR response for both RTA and SYM theory. This indicates that MIS* equations can potentially be employed to search for QGP EHR via heavy-ion collisions.