Orateur
Description
Heavy-ion collisions and nuclear structure provide complementary constraints on the density dependence of the symmetry energy, which can be propagated to neutron star matter through nuclear metamodels. I will present a Bayesian study combining the INDRA-FAZIA symmetry energy constraint from Ni+Ni collisions with nuclear structure information and implementing it in a recently developed nucleonic metamodel. This new metamodel allows us to select both global neutron star observables and their composition-dependent properties, like the direct-Urca mass threshold.
We quantify how the laboratory constraints impact the low-mass neutron star structures. More interestingly, we assess the shift in the inferred internal composition of neutron stars due to the new INDRA-FAZIA data, finding that it strongly suppresses the opening of the direct-Urca channel for low- and intermediate-mass stars.