Properties of dense, asymmetric nuclear matter in Dirac-Brueckner-Hartree-Fock approach

TL;DR

This paper investigates the properties of dense, asymmetric nuclear matter using the Dirac-Brueckner-Hartree-Fock approach with Bonn potentials, providing practical parametrizations for equations of state and nucleon self-energies relevant for neutron star modeling.

Contribution

It introduces detailed analyses of approximations in calculations and offers accurate parametrizations for the equation of state and nucleon self-energies in dense nuclear matter.

Findings

Validated angle-averaged approximation for self-energies

Provided polynomial parametrizations for nucleon self-energies

Achieved accurate reproduction of numerical results at high densities

Abstract

Within the Dirac-Brueckner-Hartree-Fock approach, using the Bonn potentials, we investigate the properties of dense, asymmetric nuclear matter and apply it to neutron stars. In the actual calculations of the nucleon self-energies and the energy density of matter, we study in detail the validity of an angle-averaged approximation and an averaging of the total momentum squared of interacting two-nucleons in nuclear matter. For practical use, we provide convenient parametrizations for the equation of state for symmetric nuclear matter and pure neutron matter. We also parametrize the nucleon self-energies in terms of polynomials of nucleon momenta. Those parametrizations can accurately reproduce the numerical results up to high densities.