Damping of sound waves in superfluid nucleon-hyperon matter of neutron stars

Details Damping of sound waves in superfluid nucleon-hyperon matter of neutron stars Damping of sound waves in superfluid nucleon-hyperon matter of neutron stars

2009-01-26

arxiv.org/abs/0901.4108v1

Phys.Rev.D79:043004,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

15 pages, 5 figures, Phys. Rev. D accepted

Scientific paper

10.1103/PhysRevD.79.043004

We consider sound waves in superfluid nucleon-hyperon matter of massive neutron-star cores. We calculate and analyze the speeds of sound modes and their damping times due to the shear viscosity and non-equilibrium weak processes of particle transformations. For that, we employ the dissipative relativistic hydrodynamics of a superfluid nucleon-hyperon mixture, formulated recently [M.E. Gusakov and E.M. Kantor, Phys. Rev. D78, 083006 (2008)]. We demonstrate that the damping times of sound modes calculated using this hydrodynamics and the ordinary (nonsuperfluid) one, can differ from each other by several orders of magnitude.

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