Hyperon-rich matter in a two-solar-mass neutron star within the Thomas-Fermi approximation

摘要

The equation of state (EOS) of hyperon-rich matter for neutron stars (NSs) is investigated in a semi-classical mean-field (MF) model. We present a new generalized baryon-baryon interaction in phase space to derive the EOS by the Thomas-Fermi approximation. Our findings have profound consequences for the structure and properties of NSs. Within this statistical model, the EOS of NS matter with hyperons is stiff enough. Consequently, the results for the maximum mass of NSs are consistent with PSR J1614 - 2230 (1.97 +/- 0.04M(circle dot)) and PSR J0348 + 0432 (2.01 +/- 0.04M(circle dot)). It is also revealed that the hyperon-hyperon interactions slightly soften the EOS.