Spin Susceptibility in Neutron Matter from Quantum Monte Carlo Calculations

TL;DR

This paper uses advanced quantum Monte Carlo methods to calculate the spin susceptibility of neutron matter across various densities, incorporating different nuclear interactions and boundary conditions to improve accuracy.

Contribution

It introduces comprehensive quantum Monte Carlo calculations of neutron matter spin susceptibility using both phenomenological and chiral effective field theory interactions.

Findings

Spin susceptibility varies with density and interaction type.

Finite-size effects are minimized using twist-averaged boundary conditions.

Results provide insights into neutron matter properties relevant for nuclear physics.

Abstract

The spin susceptibility in pure neutron matter is computed from auxiliary field diffusion Monte Carlo calculations over a wide range of densities. The calculations are performed for different spin asymmetries, while using twist-averaged boundary conditions to reduce finite-size effects. The employed nuclear interactions include both the phenomenological Argonne AV8$^\prime$+UIX potential and local interactions that are derived from chiral effective field theory up to next-to-next-to-leading order.