Properties of proto neutron star PSR J0737-3039A

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 ρc=0.247-0.359 fm-3,the central energy density is εc=4.30×1014-6.49×1014g·cm-3,and the central pressure is pc=3.79×1034-5.85×1034dyne·cm-2.With DD-MEI,GL85,GL97,and GM1,baryon octets appear in the PNS PSR J0737-3039A.With NL2,only the baryons n,p,A,Σ~0,∑~-,Ξ~0,and Ξ~- 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.