Heavy quark momentum diffusion coefficient in 3D gluon plasma

5 Nov 2019, 17:40
20m
Ball Room 2 (Wanda Reign Wuhan Hotel)

Ball Room 2

Wanda Reign Wuhan Hotel

Oral Presentation Initial state and approach to equilibrium Parallel Session - Initial state I

Speaker

Jarkko Peuron (FBK - Fondazione Bruno Kessler (IT))

Description

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, hard loop (HTL) perturbation theory and a kinetic theory formula, both using our recently acquired data on the gluon spectral function. The time-evolution of the momentum diffusion coefficient extracted from all three 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. We find that combining HTL expressions with the infrared enhancement of the equal-time correlation function that we have observed 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.

Primary authors

Jarkko Peuron (FBK - Fondazione Bruno Kessler (IT)) Kirill Boguslavski (University of Jyvaskyla (FI)) Tuomas Lappi (University of Jyvaskyla) Eero Aleksi Kurkela (CERN)

Presentation materials