arXiv 2001.118632020-01-31hep-phhep-lat

三维胶子等离子体中的重夸克动量扩散系数

Heavy quark momentum diffusion coefficient in 3D gluon plasma

K. Boguslavski, A. Kurkela, T. Lappi, J. Peuron

备注：: 5 pages, 4 figures, Conference Proceedings Quark Matter 2019
DOI：: 10.1016/j.nuclphysa.2020.121970

摘要：

利用实时格子方法研究了自相似区中远离平衡胶子等离子体中重夸克动量扩散系数。我们使用3种方法进行提取：不等时电场2点相关器集成的时间差，光谱重建（SR）方法的基础上测量的等时电场相关器和动力学理论（KT）公式。使用所有方法提取的动量扩散系数的时间演化与近似$t^{\frac{-1}{2}}$幂律一致。我们还研究了提取的扩散系数作为时间积分的上限的函数，并观察到，包括红外增强的等时间关联函数中的SR计算提高了与瞬态时间行为的数据的协议相当。这是一个规范不变确认的红外增强以前只观察到规范固定的关联函数。

英文摘要：

We study the heavy-quark momentum diffusion coefficient in far from equilibrium gluon plasma in a self-similar regime using real-time lattice techniques. We use 3 methods for the extraction: an unequal time electric field 2-point correlator integrated over the time difference, a spectral reconstruction (SR) method based on the measured equal time electric field correlator and a kinetic theory (KT) formula. The time-evolution of the momentum diffusion coefficient extracted using all methods is consistent with an approximate $t^{\frac{-1}{2}}$ power law. We also study the extracted diffusion coefficient as a function of the upper limit of the time integration and observe that including the infrared enhancement of the equal-time correlation function in the SR calculation improves the agreement with the data for transient time behavior considerably. This is a gauge invariant confirmation of the infrared enhancement previously observed only in gauge fixed correlation functions.

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