Hyperon-mixed neutron star with universal many-body repulsion

Neutron stars with large masses ∼ 2M⊙ require the hard stiffness of equation of state (EoS) of neutron-star matter. On the other hand, hyperon mixing brings about remarkable softening of EoS. In order to solve this problem, a multi-pomeron exchange potential (MPP) is introduced as a model for the universal many-body repulsion in baryonic systems on the basis of the Extended Soft Core (ESC) baryonbaryon interaction. The strength of MPP is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The interactions in ΛN , ΣN and ΞN channels are shown to be consistent with experimental indications. The EoS in neutron-star matter with hyperon mixing is obtained from ESC in addition of MPP, and mass-radius relations of neutron stars are derived. The maximum mass is shown to reach 2M⊙ even in the case of including hyperon mixing on the basis of model-parameters determined by terrestrial experiments. PACS. 21.65.Cd 21.80.+a 25.70.-z 26.60.Kp