Impact of chiral hyperonic three-body forces on neutron stars

We study the effects of the nucleon-nucleon-lambda (NN) three-body force on neutron stars. In particular, we consider the NNforce recently derived by the Julich-Bonn-Munich group within the framework of chiral effective field theory at next-to-next-to-leading order. This force, together with realistic nucleon-nucleon, nucleon-nucleon-nucleon and nucleon-hyperon interactions, is used to calculate the equation of state and the structure of neutron stars within the many-body non-relativistic Brueckner-Hartree-Fock approach. Our results show that the inclusion of the NNforce leads to an equation of state stiff enough such that the resulting neutron star maximum mass is compatible with the largest currently measured (similar to 2M circle dot) neutron star masses. Using a perturbative many-body approach we calculate also the separation energy of the in some hypernuclei finding that the agreement with the experimental data improves for the heavier ones when the effect of the NN Lambda force is taken into account.