The influence of antikaon condensations on nucleon 1S0 superfluidity in neutron star matter. Issue 3 (23rd November 2017)

• Record Type: Journal Article
• Authors: Xu, Yan; Huang, Xiu Lin; Zhang, Xiao Jun; Yu, Zi; Fan, Cun Bo; Ding, Wen Bo; Liu, Cheng Zhi
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 474:Issue 3(2018)
• Page Start: 3576
• Page End: 3581
• Publication Date: 2017-11-23
• Subjects: stars: neutron; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stx2999
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: The properties of neutron and proton 1 S 0 superfluidity are studied within the relativistic mean field and the Bardeen–Cooper–Schrieffer theories by taking the effects of K − and $\bar{K}^{0}$ condensations into account in neutron star matter without the hyperon degrees of freedom. It is found that antikaon condensations change the Fermi momenta, the effective masses and the single particle energies of nucleons in neutron star matter. These changes lead to a strong suppression of the neutron 1 S 0 superfluidity and an obvious enhancement of the proton 1 S 0 superfluidity in neutron star matter, respectively. In particular, the neutron and proton 1 S 0 pairing gaps are gradually shrinking with the optical potential of antikaons from −80 to −130 MeV. And antikaon condensations have little influence on the neutron 1 S 0 superfluid range, however, they have been markedly downsized the proton 1 S 0 superfluid range as the deepening of the optical potential of antikaons in neutron star matter. We also found that the nucleon 1 S 0 superfluidity and K − condensations within the scope of above optical potential of antikaons can occur in the core of PSR J1614-2230 and PSR J0348+0432 at the same time. Whereas $\bar{K}^{0}$ condensations only occur in the two pulsars when the range of optical potential of antikaons is from −100 to −130 MeV.