Bulk viscosity in superfluid neutron star cores. III. Effects of ${\Sigma }^{-}$ hyperons

Abstract

Bulk viscosity of neutron star cores containing hyperons is studied taking into account non-equilibrium weak process $n+n\rightleftharpoons p+{\Sigma }^{-}$. Rapid growth of the bulk viscosity within the neutron star core associated with switching on new reactions (modified Urca process, direct Urca process, hyperon reactions) is analyzed. The suppression of the bulk viscosity by superfluidity of baryons is considered and found out to be very important.

LaTeX, 9 pages, added reference, version accepted by Astron. Astrophys

References in corpus (3)

• Neutrino Emission from Neutron Stars
• Bulk viscosity in superfluid neutron star cores. II. Modified Urca processes in $npe\mu$ matter
• Thermal Conductivity of Neutrons in Neutron Star Cores

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