Regular Article - Theoretical Physics
Effect of hyperon interaction on properties of proto neutron star PSR J0740+6620
School of Sciences, Southwest Petroleum University, 610500, Chengdu, China
Accepted: 26 July 2022
Published online: 6 August 2022
The effect of the interaction between hyperons on the properties of proto neutron star (PNS) PSR J0740+6620 is examined with relativistic mean field theory in consideration of a baryon octet. The nucleon coupling constant GM1 is used and the temperature of the PNS is chosen as T = 20 MeV. Under the constraint of the mass of the PNS PSR J0740+6620 M = 2.14 M, the PNS’s radius decreases by 0.13% from R = 14.262 km to R = 14.243 km, the central chemical potential of the neutron increases by 0.23% from = 6.868 fm to = 6.884 fm, the central chemical potential of the electron decreases by 1.4% from = 1.001 fm to = 0.987 fm and the central energy density increases by 1.4% from = 1.117 g cm to = 1.133 g cm, taking into account the interaction between the hyperons. The interaction between hyperons also has an effect on the effective mass and the effect is greatest at the centers of PNSs. Baryons n, p, , , , , and all will be generated in PNS PSR J0740+6620 regardless of whether the interaction between hyperons is considered. Considering the interaction between hyperons, the relative density of n decreases, while the relative density of p, , , , , and increases, indicating that more n are converted into p and hyperons such as , , , , and in the PNS.
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