Speaker
Description
Weakly Interacting Massive Particles (WIMPs) can be captured in
compact stars such as white dwarves (WDs). If they are in a Dark Matter
(DM)-rich environment, this process can lead to an increase in the star
luminosity because of the DM annihilation process. N-body simulations
indicate that the core of the Messier 4 globular cluster (where plenty of
WDs are observed) is rich of DM. We make this assumption to analyze
the Inelastic Dark Matter (IDM) scenario, showing that when the DM
mass exceeds a few tens GeV DM mass splittings as large as 40 MeV can
be probed. This largely exceeds the sensitivity to the IDM mass splitting
from direct detection in terrestrial detectors, which does not exceed 200
keV. We also apply such constraint to the specific DM scenario of self
conjugate bi-doublet in the left-right symmetric model, where the
standard SU(2) left group with coupling gL is extended by an additional
SU(2) right group with coupling gR. In such scenario, we show that
bounds from WDs significantly reduce the cosmologically viable
parameter space, especially requiring gR>gL.
