scholarly journals Vortices in low-density neutron matter and cold Fermi gases

2019 ◽  
Vol 100 (1) ◽  
Author(s):  
Lucas Madeira ◽  
Stefano Gandolfi ◽  
Kevin E. Schmidt ◽  
Vanderlei S. Bagnato
Keyword(s):  
Neutron Matter ◽  
Fermi Gases ◽  
Low Density ◽  
Cold Fermi Gases

scholarly journals Low-Density Neutron Matter and the Unitary Limit

2021 ◽  
Vol 9 ◽  
Author(s):  
Isaac Vidaña
Keyword(s):  
Quantum Monte Carlo ◽  
Cold Atoms ◽  
Scattering Length ◽  
Fermi Gas ◽  
Neutron Matter ◽  
Bcs Theory ◽  
Unitary Limit ◽  
Strong Coupling Regime ◽  
Low Density ◽  
Contact Parameter

We review the properties of neutron matter in the low-density regime. In particular, we revise its ground state energy and the superfluid neutron pairing gap and analyze their evolution from the weak to the strong coupling regime. The calculations of the energy and the pairing gap are performed, respectively, within the Brueckner–Hartree–Fock (BHF) approach of nuclear matter and the Bardeen–Cooper–Schrieffer (BCS) theory using the chiral nucleon-nucleon interaction of Entem and Machleidt at N3LO and the Argonne V18 phenomenological potential. Results for the energy are also shown for a simple Gaussian potential with a strength and range adjusted to reproduce the 1S0 neutron-neutron scattering length and effective range. Our results are compared with those of quantum Monte Carlo (QMC) calculations for neutron matter and cold atoms. The Tan contact parameter in neutron matter is also calculated, finding a reasonable agreement with experimental data from ultra-cold atoms only at very low densities. We find that low-density neutron matter exhibits a behavior close to that of a Fermi gas at the unitary limit, although, this limit is actually never reached. We also review the properties (energy, effective mass, and quasiparticle residue) of a spin-down neutron impurity immersed in a low-density free Fermi gas of spin-up neutrons already studied by the author in a recent work where it was shown that these properties are very close to those of an attractive Fermi polaron in the unitary limit.

scholarly journals Quantum sound-cone fluctuations in cold Fermi gases: Phonon propagation

2015 ◽  
Vol 91 (5) ◽  
Author(s):  
Jen-Tsung Hsiang ◽  
Da-Shin Lee ◽  
Chi-Yong Lin ◽  
Ray J. Rivers
Keyword(s):  
Fermi Gases ◽  
Cold Fermi Gases
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