|
Résumé |
Astrophysical systems, such as stars, have long been used as laboratories of
non-
standard species, including axion-like, millicharged, and majoron-like
particles.
For heavier species with MeV-scale masses, extremely hot environments, such as
the
cores of supernovae, provide the most competitive probes. Historically, studies
of
new particles in supernovae have focused on their effects on the non-standard
cooling of the core. In this talk, I will critically review the status of these
cooling bounds in light of a recent reanalysis of the SN 1987A neutrino
observations. I will also introduce a set of novel observables recently proposed
in supernovae, complementary to cooling rates, which provide stronger bounds on
non-standard emission. These include the detection of decay products from non-
standard particles and the energy they deposit in the supernova mantle. Building
on this, I will also introduce neutron star mergers, particularly the multi-
messenger observation of the GW 170817 event, as a modern and competitive probe
for heavy non-standard particles. |
