Hyperon bulk viscosity in strong magnetic fields

Abstract

We study the bulk viscosity of neutron star matter including $\Lambda$ hyperons in the presence of quantizing magnetic fields. Relaxation time and bulk viscosity due to both the non-leptonic weak process involving $\Lambda$ hyperons and direct Urca processes are calculated here. In the presence of a strong magnetic field of $10^{17}$ G, the hyperon bulk viscosity coefficient is reduced whereas bulk viscosity coefficients due to direct Urca processes are enhanced compared with their field free cases when many Landau levels are populated by protons, electrons and muons.

LaTex, 28 pages including 9 figures; new results are discussed in section IV

References in corpus (6)

• Bulk viscosity of strange quark matter: Urca versus non-leptonic processes
• Bulk viscosity due to kaons in color-flavor-locked quark matter
• Bulk viscosity in nuclear and quark matter: A short review
• Bulk viscosity in kaon condensed matter
• Baryon number conservation and enforced electric charge neutrality for bulk viscosity in quark matter
• Modelling the dynamics of superfluid neutron stars