We discuss the ordinary, non-supersymmetric SO(10) as a theory of fermion masses and mixings. We construct two minimal versions of the Yukawa sector based on 126H and either 10H or 120H. The latter case is of particular interest since it connects the absolute neutrino mass scale with the size of the atmospheric mixing angle θA. It also relates the smallness of Vcb with the largeness of θA. Thes...

We show that hidden hot dark matter, hidden-sector dark matter with interactions that decouple when it is relativistic, is a viable dark matter candidate provided it has never been in thermal equilibrium with the particles of the standard model. This hidden hot dark matter may reheat to a lower temperature and number density than the visible Universe and thus account, simply with its thermal ab...

The Friedman equation is solved for a universe containing hot-dark matter and cold dark matter. In this scenario, hot-dark matter drives an accelerating universe no cold dark matter.

We investigate the possibility that dark matter abundance is sourced by baryon/lepton asymmetry of early Universe. It turns out a Goldstone field local classically preserved symmetry in Standard Model experiences kick during period number generation. This mechanism can be regarded as dynamical generation initial conditions for misalignment yet prediction relic presents an inverse dependence on ...

Abstract The observational relation between the density of baryon and dark matter in the Universe, ΩDM/ΩB ≃ 5, is one of the most difficult problems to solve in modern cosmology. We discuss a scenario that explains this relation by combining the asymmetric dark matter scenario and the spontaneous baryogenesis associated with the flat direction in the supersymmetric standard model. A part of bar...

The Universe on large scales is well described by the ΛCDM cosmological model. There however remain some heavy clouds on our global understanding, especially on galaxy scales, which we review here. While some of these clouds might perhaps disappear through small compensatory adjustments of the model, such as changing the mass of the dark matter particles or accounting better for baryonic physic...

A thorough analysis of sneutrinos as dark matter candidates is performed, in different classes of supersymmetric models, as is typically done for the neutralino dark matter. First in the Minimal Supersymmetric Standard Model, sneutrinos are marginally compatible with existing experimental bounds, including direct detection, provided they compose a subdominant component of dark matter. Then supe...