Bulk viscosity of superfluid hyperon stars

Details Bulk viscosity of superfluid hyperon stars Bulk viscosity of superfluid hyperon stars

2008-06-30

arxiv.org/abs/0806.4914v1

Phys.Rev.D78:083006,2008

Astronomy and Astrophysics

Astrophysics

22 pages, 2 figures

Scientific paper

10.1103/PhysRevD.78.083006

We calculated bulk viscosity due to non-equilibrium weak processes in superfluid nucleon-hyperon matter of neutron stars. For that, the dissipative relativistic hydrodynamics, formulated in paper [1] for superfluid mixtures, was extended to the case when both nucleons and hyperons are superfluid. It was demonstrated that in the most general case (when neutrons, protons, Lambda, and Sigma^{-} hyperons are superfluid), non-equilibrium weak processes generate sixteen bulk viscosity coefficients, with only three of them being independent. In addition, we corrected an inaccuracy in a widely used formula for the bulk viscosity of non-superfluid nucleon-hyperon matter.

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