Heavy quark diffusion in an overoccupied gluon plasma
Boguslavski, K., Kurkela, A., Lappi, T., & Peuron, J. (2020). Heavy quark diffusion in an overoccupied gluon plasma. Journal of High Energy Physics, 2020(9), Article 77. https://doi.org/10.1007/jhep09(2020)077
Published inJournal of High Energy Physics
© The Authors. Article funded by SCOAP3
We extract the heavy-quark diffusion coefficient κ and the resulting momentum broadening 〈p2〉 in a far-from-equilibrium non-Abelian plasma. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of 〈p2〉, 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 easily 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.
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Related funder(s)European Commission; Academy of Finland
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingT. L. is supported by the Academy of Finland, project No. 321840.This work is supported by the European Research Council, grant ERC-2015-CoG-681707.
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