Transport coefficients in neutron star cores in BHF approach. Comparison of different nucleon potentials

TL;DR

This paper investigates how different nucleon-nucleon potentials and three-body forces affect the thermal conductivity and shear viscosity in neutron star cores, revealing significant variations in transport coefficients depending on the potential used.

Contribution

It extends previous BHF calculations by analyzing the impact of various nucleon potentials and three-body forces on neutron star core transport properties.

Findings

Different potentials cause up to tenfold variation in nucleon transport coefficients.

Nucleons dominate thermal conductivity, leptons dominate shear viscosity.

Results highlight the sensitivity of transport properties to nuclear interaction models.

Abstract

Thermal conductivity and shear viscosity of npe$\mu$ matter in non-superfluid neutron star cores are considered in the framework of Brueckner-Hartree-Fock many-body theory. We extend our previous work (Shternin, Baldo and Haensel, 2013) by analysing different nucleon-nucleon potentials and different three-body forces. We find that the use of different potentials leads up to one order of magnitude variations in the values of the nucleon contribution to transport coefficients. The nucleon contribution dominates the thermal conductivity, but for all considered models the shear viscosity is dominated by leptons.