In this talk, I will present the first $ab\ initio$ computation of the neutrino emissivities of White Dwarf stars due to plasmon decay in a model of gauged $U(1)_{L_\mu-L_\tau}$. I will present the relevant White Dwarf luminosities over the entire mass range of the new leptophilic gauge boson $A'$. In particular, taking into account the resonance effects, where the $A'$ mass is comparable to...
Supernova explosions are extreme cosmic events that may impact not only ordinary matter but also dark matter (DM) halos. In this talk, I explore the possibility that a fraction of supernova energy is released as dark radiation, which could transform a cuspy DM halo into a cored one, potentially explaining observed cores in some dwarf galaxies. Alternatively, limits on DM core sizes provide...
