Comparative study of neutron and nuclear matter with simplified Argonne nucleon-nucleon potentials

TL;DR

This paper compares various many-body theoretical approaches to calculate the energy of neutron and nuclear matter using simplified Argonne potentials, highlighting the significance of spin-orbit and tensor correlations across densities.

Contribution

It provides a comprehensive comparison of multiple many-body theories applied to nuclear matter with simplified potentials, emphasizing the role of specific correlations.

Findings

Spin-orbit and tensor correlations are crucial across a wide density range.

Different many-body methods yield consistent results within uncertainties.

The study clarifies the impact of correlations on the equation of state.

Abstract

We present calculations of the energy per particle of pure neutron and symmetric nuclear matter with simplified Argonne nucleon-nucleon potentials for different many-body theories. We compare critically the Brueckner-Hartree-Fock results to other formalisms, such as the Brueckner-Bethe-Goldstone expansion up to third order, Self-Consistent Green's Functions, Auxiliary Field Diffusion Monte Carlo, and Fermi Hyper Netted Chain. We evaluate the importance of spin-orbit and tensor correlations in the equation of state and find these to be important in a wide range of densities.