CAOSP abstracts, Volume: 52, No.: 2, year: 2022

Author(s): Zhao, X.F.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 52, no. 2, p. 58-71.
Date: 09/2022
Title: The interaction between hyperons and the surface gravitational redshift of proto neutron star PSR J0740+6620
Keyword(s): stars: binaries, general: stars
Object(s): PSR J0740+6620
Pages: 58 -- 71
DOI: https://doi.org/10.31577/caosp.2022.52.2.58
NASA ADS Abstract Service: 2022CoSka..52b..58Z
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: An effect of the contributions from σ^* and ϕ mesons on the surface gravitational redshift of PNS PSR J0740+6620 is studied with relativistic mean field theory in consideration of a baryon octet. We find that the energy density ε increases relative to the same pressure p as the contributions from σ^* and ϕ mesons are taken into account. Relative to the same central energy density, the radius R of the PNS increases while the mass M, the mass radius ratio M/R and the surface gravitational redshift z of the PNS decrease, taking into account the contributions from σ^* and ϕ mesons. Under the constraint of mass M=2.08 M_☉, considering the contributions from σ^* and ϕ mesons, for the PNS PSR J0740+6620, the radius decreases by about -0.08%, the central energy density increases by about 0.89%, the central pressure increased by about 0.76%, the mass radius ratio increases by about 0.08%, and the surface gravitational redshift increases by about 0.17% from z=0.31663 to z=0.31718.