Neutron stars with Hyperons in Dirac-Brueckner-Hartree-Fock approach

摘要: Using the Dirac-Brueckner-Hartree-Fock (DBHF) approach including hyperon degrees of freedom, we investigate properties neutron-star matter. To handle hyperons in matter, first examine importance space part baryon self-energies at high densities, and secondly study effect negative-energy states baryons, which can provide an unambiguous relationship between in-medium reaction matrices for baryon-baryon scattering self-energies. We solve coupled, Bethe-Salpeter equations nuclear-matter rest frame by using Bonn potentials. assume that eight kinds nonstrange strange mesons ($\sigma,\,\delta,\,\omega,\,\rho,\,\eta,\,\pi,\,K,\,K^{\ast}$) take interactions two baryons. Then, calculate self-energies, energy density pressure The present calculation provides a hard equation state matter is generated Pauli exclusion, short-range correlations etc. finally predict maximum mass $2.02\,M_{\odot}$, consistent with both recently observed masses, $1.97\pm0.04M_{\odot}$ (J1614-2230) $2.01\pm0.04M_{\odot}$ (J0348+0432).