Hyperon-mixed neutron star with universal many-body repulsion

Abstract

Neutron stars with large masses $\sim 2M_{\odot }$ 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) baryon-baryon interaction. The strength of MPP is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The interactions in $\Lambda N$, $\Sigma N$ and $\Xi N$ 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 $2M_{\odot }$ even in the case of including hyperon mixing on the basis of model-parameters determined by terrestrial experiments.

prepared for the 2015 EPJA Topical Issue on "Exotic Matter in Neutron Stars"

References in corpus (7)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Hyperon mixing and universal many-body repulsion in neutron stars
• Extended-soft-core Baryon-Baryon Model Esc08 II. Hyperon-Nucleon Interactions
• Large-mass neutron stars with hyperonization
• Extended-soft-core baryon-baryon model III. $S=-2$ hyperon-hyperon/nucleon interaction
• Medium effect in high-density region probed by nucleus-nucleus elastic scattering

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