Properties of proto neutron star PSR J0737-3039A* *Supported by the Natural Science Foundation of China (11447003) and the Special Project of Science and Technology Strategic Cooperation between Nanchong City and Southwest Petroleum University (SXHZ017)

Abstract

Using five sets of nucleon coupling constants (DD-MEI, GL85, GL97, GM1, and NL2), we find that the radius of the PNS PSR J0737-3039A is R=15.693–18.846 km, the central baryon density is =0.247–0.359 fm, the central energy density is =4.3010– 6.4910 , and the central pressure is =3.7910 – 5.8510 . With DD-MEI, GL85, GL97, and GM1, baryon octets appear in the PNS PSR J0737-3039A. With NL2, only the baryons n, p, Λ, , , , and are present. Corresponding to the same baryon density, the relative densities of the same baryon in the PNS PSR J0737-3039A calculated using different nucleon coupling constants differ greatly. The central relative baryon densities of the PNS PSR J0737-3039A calculated using different nucleon coupling constants also differ greatly.