Neutrino Emissivity of Non-equilibrium beta processes With Nucleon Superfluidity

Abstract

We investigate the influence of nucleon superfluidity on the neutrino emissivity of non-equilibrium beta processes. Calculations are performed of the reduction factors for direct and modified Urca processes with three types of nucleon superfluidity in $npe$ matter. The numerical results are given since the analytical solution is impossible. We find that the behavior of the superfluid influence is closely related to the chemical departure from beta equilibrium. For small chemical departure, the superfluid reduction factor almost only depends on the gap but is hardly affected by the departure. While for the departure large enough, it rapidly enhances the neutrino emissivity. The onset of the "enchanced" emission has some corresponding thresholds which seem to be linked to the ratio of the energy gap to the chemical departure.

11 pages, 5 figures

References in corpus (2)

• Constraining a possible time-variation of the gravitational constant through "gravitochemical heating" of neutron stars
• Non-equilibrium beta processes in superfluid neutron star cores

Cited by in corpus (5)

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• Urca reactions during neutron star inspiral
• Cooling Theory Faced with Old Warm Neutron Stars: Role of Non-Equilibrium Processes with Proton and Neutron Gaps
• Capture of Electroweak Multiplet Dark Matter in Neutron Stars
• The extension of radiative viscosity to superfluid matter