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

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arxiv astro-ph/0110575 v2 pith:OHI7Z6BA submitted 2001-10-26 astro-ph

P. Haensel (Copernicus Astronomical Center , Warszawa) , K.P. Levenfish (Ioffe Physical Technical Inst. , St.-Peterburg) , D.G. Yakovlev (Ioffe Physical Technical Inst. , St.-Petersburg) This is my paper · ORCID
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keywords bulkviscosityneutronprocessstarcoreshyperonsreactions
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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.

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  1. Oscillations of Dissipative Neutron Stars: The Impact of Hyperonic Reaction Rates

    gr-qc 2026-08 conditional novelty 6.0 of 10

    Finite hyperonic reaction rates, encoded as a complex sound speed, damp neutron-star f-modes and remove hyperonic g-modes before their restoring force vanishes, producing a tidal lag.

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