Recently, many authors showed that if the solar and atmospheric neutrino data are both described by maximal mixing vacuum oscillations at the relevant mass scale, then there exists a unique bi-maximal lepton mixing matrix for three neutrino flavors. We construct the lepton mass matrices from the symmetry principle so that maximal mixings for the atmospheric and the solar neutrino vacuum oscilla...

If neutrino oscillation plays a role in explaining the atmospheric neutrino deficit, then the same phenomenon would necessarily affect also the dark matter indirect-detection signal which consists in a muon-neutrino flux produced by neutralino annihilation in the Earth core. In this paper we investigate to which extent the upgoingmuon signal originated by neutralinos captured inside the Earth w...

Future neutrino oscillation experiments will lead to precision measurements of neutrino mass splittings and mixings. The flavour structure of the lepton sector will therefore at some point become better known than that of the quark sector. This article discusses the potential of future oscillation experiments on the basis of detailed simulations with an emphasis on experiments which can be done...

We will start with a brief overview of neutrino oscillation physics with emphasis on the remaining unanswered questions. Next, after mentioning near future reactor and accelerator experiments searching for a non zero θ13, we will introduce the plans for the next generation of long-baseline accelerator neutrino oscillation experiments. We will focus on experiments utilizing powerful (0.7 2.1 MW)...

We present a short review of the present status of the problem of neutrino masses and mixing. The existing experimental results indicate that there are at least four massive neutrinos. We show that only two schemes with mixing of four neutrinos and mass spectra in which two groups of close masses are separated by the \LSND gap" ( 1 eV) are compatible with the results of all neutrino oscillation...

If neutrinos have mass, they can be at rest. If neutrinos can oscillate between types with different masses, then Einstein’s relation E = mc [1], where c is the speed of light in vacuum, implies that the (rest) energy of a neutrino changes during a mass oscillation. Does the phenomenon of neutrino-mass oscillation imply that energy is not conserved, or (if energy is always conserved) are claims...

We have constructed an explicit see-saw model containing two singlet neutrinos, one carrying a (B − 3Le) gauge charge with an intermediate mass scale of ∼ O(10) GeV along with a sterile one near the GUT (grand unification theory) scale of ∼ O(10) GeV. With these mass scales and a reasonable range of Yukawa couplings, the model can naturally account for the near-maximal mixing of atmospheric neu...

Neutrino flavor oscillations are currently the most favored way to understand the larger solar B neutrino interaction rate measured by Super-Kamiokande (SK) with respect to the B rate reported by the SNO-collaboration. The SNO rate includes only e-type B neutrinos while SK measures solar neutrinos via neutrino-electron elastic scattering which has a small sensitivity to other (active) flavors a...

The definition and derivation of flavor neutrino states in the framework of standard Quantum Field Theory is reviewed, clarifying some subtle points. It is shown that a flavor neutrino state that describes a neutrino produced or detected in a charged-current weak interaction process depends on the process under consideration and is appropriate for the description of neutrino oscillations as wel...

I review the interpretation of solar and atmospheric neutrino data in terms neutrino oscillations and describe some ways to account for the required neutrino masses and mixing angles from first principles, both within topdown and bottom-up approaches. I also discuss non-oscillation phenomena such as ββ0ν which may probe the absolute scale of neutrino mass, and also reveal its Majorana nature. I...