Hyperonic equations of state raise the dominant postmerger gravitational-wave frequency by a few percent and reduce the prompt black hole formation threshold by about 0.05 solar masses.
Hyperon mixing and universal many-body repulsion in neutron stars
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abstract
A multi-pomeron exchange potential (MPP) is proposed as a model for the universal many-body repulsion in baryonic systems on the basis of the Extended Soft Core (ESC) bryon-baryon interaction. The strength of MPP is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The interaction in $\Lambda N$ channels is shown to reproduce well the experimental $\Lambda$ binding energies. The equation of state (EoS) in neutron matter with hyperon mixing is obtained including the MPP contribution, and mass-radius relations of neutron stars are derived. It is shown that the maximum mass can be larger than the observed one $2M_{\odot}$ even in the case of including hyperon mixing on the basis of model-parameters determined by terrestrial experiments.
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The impact of hyperons on neutron star mergers: gravitational waves, mass ejection and black hole formation
Hyperonic equations of state raise the dominant postmerger gravitational-wave frequency by a few percent and reduce the prompt black hole formation threshold by about 0.05 solar masses.