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arXiv · 2001.11863

Heavy quark momentum diffusion coefficient in 3D gluon plasma

K. Boguslavski·A. Kurkela·T. Lappi·J. Peuron
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Abstract

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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K. Boguslavski, A. Kurkela, T. Lappi, J. Peuron. 2020-01-31. Heavy quark momentum diffusion coefficient in 3D gluon plasma. https://doi.org/10.1016/j.nuclphysa.2020.121970

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