Heavy quark diffusion in an overoccupied gluon plasma

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http://hdl.handle.net/10138/319335

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Boguslavski , K , Kurkela , A , Lappi , T & Peuron , J 2020 , ' Heavy quark diffusion in an overoccupied gluon plasma ' , Journal of High Energy Physics , vol. 2020 , no. 9 , 77 . https://doi.org/10.1007/JHEP09(2020)077

Title: Heavy quark diffusion in an overoccupied gluon plasma
Author: Boguslavski, K.; Kurkela, A.; Lappi, T.; Peuron, J.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2020-09-10
Language: eng
Number of pages: 40
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/319335
Abstract: We extract the heavy-quark diffusion coefficient kappa and the resulting momentum broadening <p(2)> 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 <p(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 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.
Subject: 114 Physical sciences
Lattice QCD
Quark-Gluon Plasma
Heavy Quark Physics
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