In proto-neutron stars with strong magnetic fields, the neutrino-nucleon scattering/absorption cross sections depend on the direction of neutrino momentum with respect to the magnetic field axis, a manifestation of parity violation in weak interactions. We study the deleptonization and thermal cooling (via neutrino emission) of proto-neutron stars in the presence of such asymmetric neutrino opa...

The last five years have been extraordinary for neutrino physics, with the Super-Kamiokande evidence of atmospheric neutrino oscillations1, the SNO evidence of solar neutrino oscillations2,3, the KamLAND 4 and K2K 5 confirmations of these evidences with neutrinos from controlled laboratory sources. As a result of the findings of these and other important experiments, a scenario of bilarge mixin...

In proto-neutron stars with strong magnetic fields, the neutrino-nucleon scattering/absorption cross sections depend asymmetrically on the direction of neutrino momentum with respect to the magnetic field axis, a manifestation of parity violation in weak interactions. We develop the moment formalism of neutrino transport in the presence of such asymmetric neutrino opacities. For a given neutrin...

Phenomenological implications of neutrino oscillations implied by recent experimental data on pattern of neutrino mass matrix are diss-cussed. It is shown that it is possible to have a neutrino mass matrix which shows approximate flavor symmetry; the neutrino mass differences arise from flavor violation in off-diagonal Yukawa couplings. Two modest extensions of the standard model, which can emb...

MINOS is a long baseline neutrino oscillation experiment designed to make precision measurements of the neutrino mixing parameters associated with the atmospheric neutrino mass splitting. Using a neutrino beam from the Main Injector (NuMI) facility at Fermilab, it compares the neutrino energy spectrum for neutrino interactions observed in two large detectors located at Fermilab and in the Souda...

How neutrino oscillations can induce an effective neutrino number of less than 3 during Big Bang Nucleosynthesis. Abstract Ordinary-sterile neutrino oscillations can generate significant neutrino asymmetry in the early Universe. In this paper we extend this work by computing the evolution of neutrino asymmetries and light element abundances during the Big Bang Nucleosyn-thesis (BBN) epoch. We s...

We investigate the muon neutrino event rate in km neutrino telescopes due to a number of galactic supernova remnants expected on the basis of these objects’ known γ-ray signals. We evaluate the potential of these neutrino signals to exhibit evidence of the sub-dominant neutrino oscillations expected in various neutrino mixing schemes including pseudo-Dirac scenarios and the Exact Parity Model. ...

A possibility to search for a heavy isosinglet (sterile) neutrino using its decay mode νs → l + 2 jets in the S channel production pp → W ∗ +X → lνs +X in the CMS experiment is studied. The only assumption about the heavy neutrino is its nonzero mixing with νe or νμ. The corresponding CMS discovery potential expressed in terms of the heavy neutrino mass and the mixing parameter between the heav...

It is considered that observed data coming from atmospheric neutrino experiments 1 are compelling evidence of neutrino oscillation indicating the presence of neutrino mass and flavor mixing . This is now being confirmed by the ongoing K2K experiment . Results of the solar neutrino experiments 5 are also supporting such mass induced neutrino oscillations hypothesis, either through the matter enh...

The investigation of the problem of neutrino masses and mixing is the central theme of today’s neutrino physics. This problem is very important for elementary particle physics. There is a general belief that its investigation is a way to discover new physics. The problem of the masses of the neutrinos has also an exceptional importance for astrophysics. If the neutrino masses are in the eV regi...