Bulk viscosity in superfluid neutron star cores: Effects of Sigma- hyperons

P. Haensel
N. Copernicus Astronomical Center, Warsaw, Poland
K. P. Levenfish and D. G. Yakovlev
Ioffe Physico-Technical Institute, St. Petersburg, Russia

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

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