Chiral effective field theory description of neutrino nucleon-nucleon Bremsstrahlung in supernova matter. (arXiv:1905.13634v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Guo_G/0/1/0/all/0/1">Gang Guo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martinez_Pinedo_G/0/1/0/all/0/1">Gabriel Martínez-Pinedo</a>
We revisit the rates of neutrino pair emission and absorption from
nucleon-nucleon Bremsstrahlung in supernova matter using the $T$-matrix
formalism in the long wavelength limit. Based on chiral effective field theory
($chi$EFT) two-body potentials, we solve the Bethe-Goldstone equation
accounting for the in-medium $T$-matrix including non-diagonal contributions.
Our calculations consider nucleons with arbitrary degree of degeneracy and
hence account for final state Pauli blocking. We compare our results with one
pion exchange (OPE) rates, commonly used in supernova simulations, and
calculations using an effective on-shell diagonal $T$-matrix from measured
phase shifts. We also estimate that multi-scattering processes and RPA
correlations introduce small corrections on top of the in-medium $T$-matrix
results at subsaturation densities.
We revisit the rates of neutrino pair emission and absorption from
nucleon-nucleon Bremsstrahlung in supernova matter using the $T$-matrix
formalism in the long wavelength limit. Based on chiral effective field theory
($chi$EFT) two-body potentials, we solve the Bethe-Goldstone equation
accounting for the in-medium $T$-matrix including non-diagonal contributions.
Our calculations consider nucleons with arbitrary degree of degeneracy and
hence account for final state Pauli blocking. We compare our results with one
pion exchange (OPE) rates, commonly used in supernova simulations, and
calculations using an effective on-shell diagonal $T$-matrix from measured
phase shifts. We also estimate that multi-scattering processes and RPA
correlations introduce small corrections on top of the in-medium $T$-matrix
results at subsaturation densities.
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