Hyperon bulk viscosity in strong magnetic fields
Monika Sinha, Debades Bandyopadhyay
TL;DR
This paper investigates how strong magnetic fields affect the bulk viscosity of neutron star matter containing hyperons, revealing that magnetic fields can both suppress and enhance different viscosity mechanisms.
Contribution
It provides the first detailed calculation of hyperon bulk viscosity in strong magnetic fields, considering Landau level effects on various weak processes.
Findings
Hyperon bulk viscosity decreases under strong magnetic fields.
Bulk viscosity from direct Urca processes increases with magnetic field strength.
Magnetic fields significantly alter neutron star matter dissipation mechanisms.
Abstract
We study the bulk viscosity of neutron star matter including hyperons in the presence of quantizing magnetic fields. Relaxation time and bulk viscosity due to both the non-leptonic weak process involving hyperons and direct Urca processes are calculated here. In the presence of a strong magnetic field of 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.
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