Neutrino Mass Anarchy

Models of Neutrino Masses: Anarchy versus Hierarchy

We present a quantitative study of the ability of models with different levels of hierarchy to reproduce the solar neutrino solutions, in particular the LA solution. As a flexible testing ground we consider models based on SU(5)×U(1)F. In this context, we have made statistical simulations of models with different patterns from anarchy to various types of hierachy: normal hierarchical models wit...

Low-Energy Neutrino Physics and Neutrino Mass

Neutrino Trapping and Neutrino Mass Bounds

It has been shown recently that the exchange of virtual νν̄ pairs leads to an unphysically large energy-density in neutron stars and white dwarfs, unless neutrinos have a minimum mass,mν > ∼ 0.4 eV/c 2 . Here we consider the possibility that the presence of trapped low-energy neutrinos can suppress the exchange of virtual νν̄ pairs, thereby avoiding a large energy-density even for massless neutri...

Bimaximal Neutrino Mixing and Neutrino Mass Matrix

We show that the bimaximal neutrino mixing pattern suggested by the solar and atmospheric neutrino data can be derived from the maximal, symmetric , four neutrino mixing in the limit that one of the neutrinos is made heavy. Imposing the constraints of no neutrinoless double beta decay and a 20% hot dark matter component of the universe leads to a three neutrino mass matrix recently suggested by...

Majorana neutrino mass

We treat 0+ → 2+ 0νββ decays taking into account recoil corrections to the nuclear currents. The decay probability can be written as a quadratic form of the effective coupling constants of the right-handed leptonic currents and the effective neutrino mass. We calculate the nuclear matrix elements for the 0+ → 21 0νββ decays of 76Ge and 100Mo, and demonstrate that the relative sensitivities of 0...