Monday, December 3, 2012

1211.7208 (Kohsuke Tsubakihara et al.)

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

Kohsuke Tsubakihara, Akira Ohnishi
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.
View original: http://arxiv.org/abs/1211.7208

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