Bulk Viscosity in Neutron Stars from Hyperons

Details Bulk Viscosity in Neutron Stars from Hyperons Bulk Viscosity in Neutron Stars from Hyperons

2003-11-28

arxiv.org/abs/nucl-th/0311103v1

Phys.Rev. C69 (2004) 025802

Physics

Nuclear Physics

Nuclear Theory

18 pages, to appear in Physical Review C

Scientific paper

10.1103/PhysRevC.69.025802

The contribution from hyperons to the bulk viscosity of neutron star matter is calculated. Compared to previous works we use for the weak interaction the one-pion exchange model rather than a current-current interaction, and include the neutral current $nn \leftrightarrow n\Lambda$ process. Also the sensitivity to details of the equation of state is examined. Compared to previous works we find that the contribution from hyperons to the bulk viscosity is about two orders of magnitude smaller.

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