Strong-coupling effects of pairing fluctuations, and Anderson-Bogoliubov mode in neutron S0 1 superfluids in neutron stars

Daisuke Inotani, Shigehiro Yasui, Muneto Nitta

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We investigate effects of thermal and quantum fluctuations of the superfluid order parameter in S01 superfluids in neutron stars. We construct a separable potential to reproduce the S01 phase shift reconstructed by using the partial wave analysis from nucleon scattering data. We include superfluid fluctuations within a strong-coupling approximation developed by Nozières 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.

Original languageEnglish
Article number065802
JournalPhysical Review C
Volume102
Issue number6
DOIs
Publication statusPublished - 2020 Dec 3

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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