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The bulk viscosity of neutron star cores containing hyperons is studied taking into account non-equilibrium weak process . The 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.
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Haensel et al. (2002) studied this question.
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