Hyperons in neutron stars

Using the Dirac-Brueckner-Hartree-Fock approach, the properties of neutron-star matter including hyperons are investigated. In the calculation, we consider both time and space components of the vector self-energies of baryons as well as the scalar ones. Furthermore, the effect of negative-energy states of baryons is partly taken into account. We obtain the maximum neutron-star mass of 2.08M(circle dot), which is consistent with the recently observed, massive neutron stars. We discuss a universal, repulsive three-body force for hyperons in matter. (C) 2015 The Authors. Published by Elsevier B.V.