Nonperturbative Extraction of the Effective Mass in Neutron Matter

Mateusz Buraczynski, Nawar Ismail, and Alexandros Gezerlis
Phys. Rev. Lett. 122, 152701 – Published 19 April 2019

Abstract

We carry out nonperturbative 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.

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  • Received 3 January 2019
  • Revised 24 February 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.152701

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Mateusz Buraczynski, Nawar Ismail, and Alexandros Gezerlis

  • Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada

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Issue

Vol. 122, Iss. 15 — 19 April 2019

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