Bulk viscous corrections to screening and damping in QCD at high temperatures
arXiv:1611.08379 · doi:10.1007/JHEP01(2017)123
Abstract
Non-equilibrium corrections to the distribution functions of quarks and gluons in a hot and dense QCD medium modify the "hard thermal loops" (HTL). The HTLs determine the retarded, advanced, and symmetric (time-ordered) propagators for gluons with soft momenta as well as the Debye screening and Landau damping mass scales. We compute such corrections to a thermal as well as to a non-thermal fixed point.The screening and damping mass scales are sensitive to the bulk pressure and hence to (pseudo-) critical dynamical scaling of the bulk viscosity in the vicinity of a second-order critical point. This could be reflected in the properties of quarkonium bound states in the deconfined phase and in the dynamics of soft gluon fields.
arXiv comment19 pages. no figure, added corrections of quadratic order in the bulk pressure to the symmetric gluon self energy, to appear in JHEP
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