近日，中国科学院近代物理研究所的尹伊及其研究团队取得一项新进展。经过不懈努力，他们揭示类QCD等离子体的非流体动力学响应。相关研究成果已于2024年5月14日在国际知名学术期刊《高能物理杂志》上发表。

据悉，夸克-胶子等离子体(QGP)在非流体力学和非微扰状态下的性质在很大程度上仍未被探索。

本文采用弛豫时间近似（RTA）中的玻尔兹曼方程，深入研究了类QGP等离子体对静态和比约肯扩展等离子体，在非流体动力梯度下初始能量-动量扰动的响应函数。研究结果显示，在非流体动力梯度的静态和膨胀背景下，所得到的响应函数表现出高度的相似性。尽管传统的一阶和二阶理论无法准确描述非水流体力学的响应，但所提出的扩展版流体力学模型能够合理地捕捉其动态行为[1]。此外，还探讨了欧几里得相关器对非流体力学响应的潜在敏感性。

附：英文原文

Title: Non-hydrodynamic response in QCD-like plasma

Author: Ke, Weiyao, Yin, Yi

Issue&Volume: 2024-05-14

Abstract: Quark-gluon plasma’s (QGP) properties at non-hydrodynamic and non-perturbative regimes remain largely unexplored. Here, we examine the response functions describing how a QGP-like plasma responds to initial energy-momentum disturbance in both static and Bjorken-expanding plasma at non-hydrodynamic gradient using the Boltzmann equation in the relaxation-time approximation (RTA). We show that the resulting response functions are remarkably similar in both static and expanding backgrounds at non-hydrodynamic gradients. While non-hydrodynamic response can not be described by the conventional first-order and second-order theories, its behavior is reasonably captured by the extended version of hydrodynamics proposed by us [1]. The potential sensitivity of the Euclidean correlator to non-hydrodynamic response is also illustrated.

DOI: 10.1007/JHEP05(2024)171

Source: https://link.springer.com/article/10.1007/JHEP05(2024)171