Suprathermal viscosity of dense matter

Details Suprathermal viscosity of dense matter Suprathermal viscosity of dense matter

2010-09-21

arxiv.org/abs/1009.4182v1

AIP Conf.Proc.1317:380-387,2011

Physics

Nuclear Physics

Nuclear Theory

8 pages

Scientific paper

10.1063/1.3536589

Motivated by the existence of unstable modes of compact stars that eventually grow large, we study the bulk viscosity of dense matter, taking into account non-linear effects arising in the large amplitude regime, where the deviation mu_Delta of the chemical potentials from chemical equilibrium fulfills mu_Delta > T. We find that this supra-thermal bulk viscosity can provide a potential mechanism for saturating unstable modes in compact stars since the viscosity is strongly enhanced. Our study confirms previous results on strange quark matter and shows that the suprathermal enhancement is even stronger in the case of hadronic matter. We also comment on the competition of different weak channels and the presence of suprathermal effects in various color superconducting phases of dense quark matter.

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