Non-perturbative Extraction of the Effective Mass in Neutron Matter

Abstract

We carry out non-perturbative calculations of the single-particle excitation spectrum in strongly interacting neutron matter. These are microscopic quantum Monte Carlo computations of many-neutron energies at different densities as well as several distinct excited states. As input, we employ both phenomenological and chiral two- and three-nucleon interactions. We use the single-particle spectrum to extract the effective mass in neutron matter. With a view to systematizing the error involved in this extraction, we carefully assess the impact of finite-size effects on the quasiparticle dispersion relation. We find an effective-mass ratio that drops from 1 as the density is increased. We conclude by connecting our results with the physics of ultracold gases as well as with energy-density functional theories of nuclei and neutron-star matter.

arXiv comment5+ pages, 3 figures; v2 corresponds to published version

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Cited by in corpus (17)

• New equations of state constrained by nuclear physics, observations, and QCD calculations of high-density nuclear matter
• $Abinitio$ constraints on thermal effects of the nuclear equation of state
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• Neutron matter at the interface(s): static response and effective mass