# Neutron matter at the interface(s): static response and effective mass

## TL;DR

This paper investigates neutron matter's static response and quasiparticle energy using Quantum Monte Carlo and energy density functional methods, providing insights relevant for nuclear physics and neutron star studies.

## Contribution

It introduces new QMC results on neutron matter quasiparticle energies and analyzes finite-size effects approaching the infinite system limit.

## Key findings

- QMC calculations of neutron matter quasiparticle energies with chiral interactions
- Analysis of finite-size effects in neutron matter simulations
- Insights into the static response of neutron matter

## Abstract

Neutron matter is interesting both as an extension of terrestrial nuclear physics and due to its significance for the study of neutron stars. In this work, after some introductory comments on nuclear forces, nuclear ab initio theory, and nuclear phenomenology, we employ two techniques, Quantum Monte Carlo (QMC) and Energy Density Functionals, to practically handle an extended system composed of strongly interacting neutrons. We start by summarizing work on the static response of neutron matter, which considers the impact of external influences on the time-independent system. We then proceed to discuss new results of the energy of quasiparticle excitations in neutron matter, including QMC calculations with chiral or phenomenological nucleon-nucleon interactions. As part of this study, we carefully study the approach of our finite-number computations toward the infinite-system limit.