Bulk viscosity of neutron stars and damping of their vibrations

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

The bulk viscosity of the superfluid neutron star cores due to the beta-processes (direct and modified URCA) involving nucleons, electons and muons is studied. It is shown that the presence of muons produces an additional contribution into the bulk viscosity due to the beta-processes with electrons and also affects that viscosity. The superfluidity may strongly reduce the bulk viscosity and affect thus damping of neutron star vibrations.

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