Gap-bridging enhancement of modified Urca processes in nuclear matter

摘要

In nuclear matter at neutron-star densities and temperatures, Cooper pairingleads to the formation of a gap in the nucleon excitation spectra resulting inexponentially strong Boltzmann suppression of many transport coefficients.Previous calculations have shown evidence that density oscillations ofsufficiently large amplitude can overcome this suppression for flavor-changing$\beta$ processes, via the mechanism of "gap bridging". We address thesimplifications made in that initial work, and show that gap bridging cancounteract Boltzmann suppression of neutrino emissivity for the realistic caseof modified Urca processes in matter with $^3P_2$ neutron pairing.