Assuming 3-ν mixing and massive Majorana neutrinos, we analyze the implications of the results of the solar neutrino experiments, including the latest SNO data, which favor the LMA MSW solution of the solar neutrino problem with tan 2 θ ⊙ < 1, for the predictions of the effective Majorana mass |< m >| in neutrinoless double beta-decay. Neutrino mass spectra with normal mass hierarchy, with inve...

Assuming 3-ν mixing and massive Majorana neutrinos, we analyze the implications of the results of the solar neutrino experiments, including the latest SNO data, which favor the LMA MSW solution of the solar neutrino problem with tan 2 θ ⊙ < 1, for the predictions of the effective Majorana mass |< m >| in neutrinoless double beta-decay. Neutrino mass spectra with normal mass hierarchy, with inve...

Resonant spin-flavour (RSF) conversions of supernova neutrinos, which is induced by the interaction between the nonzero neutrino magnetic moment and supernova magnetic fields, are studied for both normal and inverted mass hierarchy. As the case for the pure matter-induced neutrino oscillation (Mikheyev–Smirnov– Wolfenstein (MSW) effect), we find that the RSF transitions are strongly dependent o...

We propose a model that all quark and lepton mass matrices originally have the same zero texture. Namely their (1,1), (1,3) and (3,1) components are zeros. For the neutrino mass matrix, we further impose the symmetry between the second and the third generations. Then the neutrino mass matrix has a maximal νμ ντ mixing. Our model is consistent with all the neutrino oscillation experiments and th...

In the context of the minimal supersymmetric seesaw model, we study the implications of the current neutrino data for thermal leptogenesis, ββ0ν decay, and leptonic flavourand CP-violating low-energy observables. We express the heavy singlet-neutrino Dirac Yukawa couplings (Yν)ij and Majorana masses MNi in terms of the light-neutrino observables and an auxiliary hermitian matrix H , which enabl...

The PMNS neutrino mixing matrix is given, in general, by the product of two unitary matrices associated with the diagonalization of the charged lepton and neutrino mass matrices, respectively. Assuming that the active flavor neutrinos possess a Majorana mass matrix which is diagonalized by a bimaximal mixing matrix, we give the allowed forms of the charged lepton mixing matrix and the correspon...

Neutrino-oscillation solutions for the atmospheric neutrino anomaly and the solar neutrino deficit can determine the texture of the neutrino mass matrix according to three types of neutrino mass hierarchies as Type A: m1 ≪ m2 ≪ m3, Type B: m1 ∼ m2 ≫ m3 , and Type C: m1 ∼ m2 ∼ m3, where mi is the i-th generation neutrino absolute mass. The relative sign assignments of neutrino masses in each typ...

Abstract Current experimental data on neutrino oscillations are consistent with the tri-bimaximal mixing. If future experimental data will determine a non-zero Ve3 and/or find CP violations in neutrino oscillations, there is the need to modify the mixing pattern. We find that a simple neutrino mass matrix, resulting from A4 family symmetry breaking with residual Z3 and Z2 discrete symmetries re...

There is a puzzling contradiction: direct observations favor a low-mass density universe, but the only model which fits universe structure over more than three orders of magnitude in distance scale has a mix of hot (neutrino) and cold dark matter constituting a critical density universe. If all present indications for neutrino mass are valid, that hot dark matter is shared by two neutrino speci...

By combining data from cosmic microwave background (CMB) experiments (including the recent WMAP third year results), large scale structure (LSS) and Lyman-α forest observations, we constrain the hypothesis of a fourth, sterile, massive neutrino. For the 3 massless + 1 massive neutrino case we bound the mass of the sterile neutrino to ms < 0.26eV (0.44eV) at 95% (99.9%) c.l.. These results exclu...