The modified D1M interactions: new gogny forces adapted for neutron star calculations

The symmetry energy of the D1 family of Gogny interactions, which describe finite nuclei properties in good agreement with experimental data, shows too soft a behaviour above saturation density. As a consequence, the D1 family of Gogny forces often cannot describe the properties of neutron stars when extrapolated to the high-density region. To overcome this limitation, we have proposed reparametrizations of the D1M interaction with very minimal changes. The modified interactions retain the quality of the original force for dealing with finite nuclei and, at the same time, are able to describe the neutron star physics with a quality similar to the one provided by the Skyrme SLy4 force, which was specially designed for this purpose