Primordial black holes (PBHs) are black holes which are believed to have formed in the very early Universe. Recently an idea that asteroid mass PBHs may be dark matter of the Universe is attracting a lot of attention. Their size is icroscopic; they are of the size of a hydrogen atom or smaller.
In this talk, I first briefly review our knowledge about dark matter and black holes, then...
Gauge symmetry can naturally accommodate dark matter stability or longevity. Hidden sectors (or dark sectors) with dark gauge symmetry would contain multiple particles , and then multi-component dark matter models become generic. , and they are not an ad hocextension of the WIMP paradigm—it is a natural consequence of a rich hidden gauge sector. Future experiments should search for rich dark...
Type-I seesaw models with a spontaneously broken B-L symmetry provide a natural framework for spontaneous leptogenesis driven by a Majoron. The kinetic background of the Majoron acts as a CP-violating source, generating a lepton asymmetry both through the decay of right-handed neutrinos and through equilibration via inverse-decay processes. We construct the Boltzmann equations in a fully...
