Impact of Nucleon-Nucleon Bremsstrahlung Rates Beyond One-Pion Exchange
Abstract
Neutrino-pair production and annihilation through nucleon-nucleon bremsstrahlung is included in current supernova simulations by rates that are based on the one-pion-exchange approximation. Here we explore the consequences of bremsstrahlung rates based on a modern nuclear interactions for proto-neutron star cooling and the corresponding neutrino emission. We find that despite a reduction of the bremsstrahlung emission by a factor of 2-5 in the neutrinospheric region, models with the improved treatment exhibit only 5% changes of the neutrino luminosities and an increase of 0.7 MeV of the average energies of the radiated neutrino spectra, with the largest effects for the antineutrinos of all flavors and at late times. Overall, the proto-neutron star cooling evolution is slowed down modestly by 0.5-1 s.
Keywords
Cite
@article{arxiv.1608.05037,
title = {Impact of Nucleon-Nucleon Bremsstrahlung Rates Beyond One-Pion Exchange},
author = {Alexander Bartl and Robert Bollig and Hans-Thomas Janka and Achim Schwenk},
journal= {arXiv preprint arXiv:1608.05037},
year = {2016}
}
Comments
11 pages, 7 figures, minor changes and additions, to appear in Phys. Rev. D