Heavy quark diffusion in an overoccupied gluon plasma

Jarkko Peuron
2022 Proceedings of The 38th International Symposium on Lattice Field Theory — PoS(LATTICE2021)   unpublished
We extract the heavy quark diffusion coefficient and the resulting momentum broadening 2 of a heavy quark embedded in a far-from-equilibrium gluon plasma using classical-statistical lattice simulations. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of 2 , followed by linear growth with time due to Langevin-type dynamics and damped oscillations around this growth at the plasmon frequency. We show that these novel oscillations are not
more » ... ly explained using perturbative techniques but result from an excess of gluons at low momenta. These oscillation are therefore a gauge invariant confirmation of the infrared enhancement we had previously observed in gauge-fixed correlation functions. We argue that the kinetic theory description of such systems becomes less reliable in the presence of this IR enhancement.
doi:10.22323/1.396.0291 fatcat:dbkkuokrg5awldusr37pgqv2mm