Hyperon-hyperon interactions and properties of neutron matter

Abstract

We present results from Brueckner-Hartree-Fock calculatons for beta stable neutron star matter with nucleonic and hyperonic degress degrees of freedom, employing the most recent parametrizations of the baryon-baryon interaction of the Nijmegen group. It is found that the only strange baryons emergin in beta stable matter up to total barionic densities of 1.2 fm^-3 are ${\Sigma }^{-}$ and $\Lambda$. The corresponding equations of state are then used to compute properties of neutron stars such as masses and radii.

Comments: 27 pages, LateX, includes 8 PostScript figures, (submitted to PRC)