Vortices in low-density neutron matter and cold Fermi gases

Lucas Madeira, Stefano Gandolfi, Kevin Schmidt, Vanderlei S. Bagnato

Research output: Contribution to journalArticle

Abstract

Cold gas experiments can be tuned to achieve strongly-interacting regimes such as that of low-density neutron matter found in neutron-stars' crusts. We report T=0 diffusion Monte Carlo results (i) for the ground state of both spin-1/2 fermions with short-range interactions and low-density neutron matter in a cylindrical container, and (ii) properties of these systems with a vortex line excitation. We calculate the equation of state for cold atoms and low-density neutron matter in the bulk systems, and we contrast it to our results in the cylindrical container. We compute the vortex line excitation energy for different interaction strengths, and we find agreement between cold gases and neutron matter for very low densities. We also calculate density profiles, which allow us to determine the density depletion at the vortex core, which depends strongly on the short-ranged interaction in cold atomic gases, but it is of ≈25% for neutron matter in the density regimes studied in this work. Our results can be used to constrain neutron matter properties by using measurements from cold Fermi gases experiments.

Original languageEnglish (US)
Article number014001
JournalPhysical Review C
Volume100
Issue number1
DOIs
StatePublished - Jul 8 2019

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vortices
neutrons
cold gas
gases
containers
cold neutrons
monatomic gases
interactions
neutron stars
excitation
crusts
depletion
equations of state
fermions
ground state
profiles
atoms
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Vortices in low-density neutron matter and cold Fermi gases. / Madeira, Lucas; Gandolfi, Stefano; Schmidt, Kevin; Bagnato, Vanderlei S.

In: Physical Review C, Vol. 100, No. 1, 014001, 08.07.2019.

Research output: Contribution to journalArticle

Madeira, Lucas ; Gandolfi, Stefano ; Schmidt, Kevin ; Bagnato, Vanderlei S. / Vortices in low-density neutron matter and cold Fermi gases. In: Physical Review C. 2019 ; Vol. 100, No. 1.
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