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

Abstract

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.

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

References in corpus (10)

• Hypernuclear Physics for Neutron Stars
• Shear viscosity in neutron star cores
• Bulk viscosity of superfluid neutron stars
• The entrainment matrix of a superfluid neutron-proton mixture at a finite temperature
• Oscillations of General Relativistic Multi-fluid/Multi-layer Compact Stars
• Temperature-dependent pulsations of superfluid neutron stars
• Occurrence of Hyperon Superfluidity in Neutron Star Cores
• Bulk viscosity of superfluid hyperon stars
• Waves and instabilities in dissipative rotating superfluid neutron stars
• Modelling the dynamics of superfluid neutron stars

Cited by in corpus (5)

• Relativistic dynamics of superfluid-superconducting mixtures in the presence of topological defects and an electromagnetic field with application to neutron stars
• The relativistic entrainment matrix of a superfluid nucleon-hyperon mixture. II. Effect of finite temperatures
• Bulk viscosity in neutron stars with hyperon cores
• Temperature effects in pulsating superfluid neutron stars
• Instability windows of relativistic r-modes in stably stratified neutron stars with hyperonic cores