Three-body force effect on neutrino emissivities of neutron stars within the framework of the Brueckner-Hartree-Fock approach

TL;DR

This paper investigates how three-body forces influence neutrino emission processes in neutron stars using the Brueckner-Hartree-Fock approach, revealing significant effects on direct Urca thresholds and neutrino emissivity in massive stars.

Contribution

It introduces a microscopic TBF into the BHF framework to analyze its impact on neutrino emissivities and thresholds in neutron star matter, highlighting effects in high-mass stars.

Findings

TBF significantly lowers direct Urca process thresholds.

Direct Urca dominates over modified Urca in neutrino emission.

TBF can increase total neutrino emissivity by about 50% in massive neutron stars.

Abstract

The three-body force (TBF) effect on the neutrino emissivity in neutron star matter and the total neutrino emissivity of neutron stars have been investigated within the framework of the Brueckner-Hartree-Fock approach by adopting the AV18 two-body interaction plus a microscopic TBF. The neutrino emissivity from the direct Urca process turns out to be much larger than that from the modified Urca process. Inclusion of the TBF reduces strongly the density thresholds of the direct Urca processes involving electrons and muons. The TBF effect on the total neutrino emissivity of neutron stars is shown to be negligibly weak for neutron stars with small masses. For neutron stars with large masses, the TBF effect becomes visible and inclusion of the TBF may enhance the total neutrino emissivity by about 50% for neutron stars with a given mass of $M=1.6M_{\odot}$.