The role of medium modifications for neutrino-pair processes from nucleon-nucleon bremsstrahlung

Impact on the protoneutron star deleptonization

Institute for Theoretical Physics, University of Wrocław, plac Maksa Borna 9, 50-204 Wrocław, Poland
e-mail: fischer@ift.uni.wroc.pl

Received: 24 May 2016
Accepted: 16 August 2016

Abstract

In this article the neutrino-pair production from nucleon-nucleon (NN) bremsstrahlung is explored via medium-modifications of the strong interactions at the level of the one-pion exchange approximation. It governs the bulk part of the NN interaction at low densities relevant for the neutrino physics in core-collapse supernova studies. The resulting medium-modified one-pion exchange rate for the neutrino-pair processes is implemented in simulations of core-collapse supernovae in order to study the impact on the neutrino signal emitted from the deleptonization of the nascent proto-neutron star (PNS). Consequences for the nucleosynthesis of heavy elements of the material ejected from the PNS surface are discussed.