Neutrino emission processes in hyperon-populated neutron stars

摘要: Several neutrino emission processes expected to occur in neutron stars containing hyperons are examined. The assumed a dense, degenerate environment subject charge and beta-equilibrium which the electrons extremely relativistic baryons nonrelativistic. Numerical results obtained for number of star scenarios characterized by fixed values fractional baryon populations electron-to-baryon ratio. In all considered, it is found that Urca dominate bremsstrahlung among processes, most important those involving nucleons alone, provided interior normal. If either neutrons or protons superfluid, however, then will contribute largest emissivities, significantly accelerating cooling. 48 references.