Production and Signatures of CP-even Scalars from Core-Collapse Supernovae

CP-even scalars appear as mediators in numerous Dark Matter models. An eventual mass mixing with the Higgs field could be a portal between the Standard Model and the Dark Sector. If so, scalars can be produced in post-collapse hot neutron stars and affect their cooling process, leading to information about mass and couplings of the scalar. Additionally, decays of the scalars into SM particle contribute to the explosion energy of the Supernova and to the photon flux detected at Earth. The obtained bounds push the limit for the couplings of the scalars to the SM to much lower values than the cooling bound.