Does a Quark-Gluon Plasma Feature an Extended Hydrodynamic Regime?,Physical Review Letters

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Does a Quark-Gluon Plasma Feature an Extended Hydrodynamic Regime?
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-05-26 , DOI: 10.1103/physrevlett.130.212303
Weiyao Ke ₁ , Yi Yin ₂

Affiliation

We investigate the response of the near-equilibrium quark-gluon plasma (QGP) to perturbation at nonhydrodynamic 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 that 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 Müller-Israel-Stewart (MIS) theory—namely MIS*—and demonstrate that it describes the EHR response for both the RTA and SYM theory. This indicates that MIS* equations can potentially be employed to search for QGP EHR via heavy-ion collisions.

中文翻译：

夸克-胶子等离子体是否具有扩展的流体动力学机制？

我们研究了近平衡夸克胶子等离子体 (QGP) 对非流体动力学梯度扰动的响应。我们提出了一个可能的场景，在该场景下，声音模式继续主导该区域的媒体响应。对于各种液体和液态金属，已经通过实验观察到这种情况。我们进一步表明，对于弛豫时间近似 (RTA) 中的弱耦合动力学方程和强耦合动力学方程，确实存在这种扩展的流体动力学机制 (EHR)