2019/12/31 by Daisuke Inotani, Shigehiro Yasui, Muneto Nitta · 4 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Coupling (piping) #Materials science #Neutron #Neutron scattering #Pairing #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Superconductivity #Superfluidity #cond-mat.quant-gas #nucl-th
paper · pdf · doi:10.1103/physrevc.102.065802
published in Physical Review C 102(6) (American Institute of Physics) · 13 pages, 6 figures
openalex created_date 2020/01/10 · openalex publication_date 2020/12/03 · arxiv created 2020/12/05 · arxiv updated 2020/12/08 · openalex updated_date 2026/08/05
We investigate effects of thermal and quantum fluctuations of the superfluid order parameter in 1S0 superfluids in neutron stars. We construct a separable potential to reproduce the 1S0 phase shift reconstructed by using the partial wave analysis from nucleon scattering data. We include superfluid fluctuations within a strong-coupling approximation developed by Nozi\`eres and Schmitt-Rink and determine self-consistently the superfluid order parameter as well as the chemical potential. We show that the quantum depletion, which gives a fraction of noncondensed neutrons at zero temperature due to quantum pairing fluctuations, plays an important role not only near the critical temperature from superfluid states to normal states but also at zero temperature. We derive the dispersion relation of Anderson-Bogoliubov modes associated with phase fluctuations and show also that there is a nonzero fraction of noncondensed components in the neutron number as a result of the strong-coupling effect. Our results indicate that superfluid fluctuations are important for thermodynamic properties in neutron stars.