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arXiv · 1211.7208

Three-body couplings in RMF and its effects on hyperonic star equation of state

Kohsuke Tsubakihara·Akira Ohnishi
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Abstract

We develop a new relativistic mean field (RMF) model including explicit three-body couplings and apply it to hyperonic systems and neutron star matter. The recent observation of the massive mass neutron star has given us a puzzle; when strange hadrons including hyperons are taken into account, the equation of state (EOS) becomes too soft to support the observed two-solar-mass neutron star. Three-baryon repulsion is a promising ingredient to answer this puzzle. We demonstrate that it is possible to consistently explain the massive neutron star and hypernuclear data when we include three-body couplings and modify the hyperon vector couplings from the flavor SU(3) values.

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Kohsuke Tsubakihara, Akira Ohnishi. 2013-04-01. Three-body couplings in RMF and its effects on hyperonic star equation of state. https://doi.org/10.1016/j.nuclphysa.2013.04.006

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