We account for the solar and atmospheric neutrino problems by introducing maximal mixing between conventional neutrinos and sterile neutrino partners. We achieve this by invoking a seesaw-like mechanism which not only provides us with maximally mixed neutrino/sterile-neutrino mass eigenstates

We show that if the solar and atmospheric data are both described by maximal vacuum oscillations at the relevant mass scales then there exists a unique mixing matrix for three neutrino flavors. The solution necessarily conserves CP and automatically implies that there is no disappearance

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Abstract. Assuming high-energy tri-bi-maximal mixing we study the radiative running of leptonic mixing angles and obtain limits on the high-energy scale from requiring consistency with the observed mixing. We construct a model in which a non-Abelian discrete family symmetry leads both to a quasi

We consider how, for quasi-degenerate neutrinos with tri-bi-maximal mixing at a high-energy scale, the mixing angles are affected by radiative running from high to low-energy scales in a supersymmetric theory. The limits on the high-energy scale that follow from consistency with the observed mixing

We consider a pattern of neutrino masses in which there is an approximate mass degeneracy between the two mass eigenstates most coupled to the νµ and ντ flavour eigenstates. Earth-matter effects can lift this degeneracy and induce an effectively maximal mixing between these two generations

This paper considers mixed, or random coefficients, multinomial logit (MMNL) models for discrete response, and establishes the following results. Under mild regularity conditions, any discrete choice model derived from random utility maximization has choice probabilities that can be approximated

Abstract. The observed neutrino mixing, having a near maximal atmospheric neutrino mixing angle and a large solar mixing angle, is close to tri-bi-maximal, putting leptonic mixing in contrast with the small mixing of the quark sector. We discuss a model in which ∆(27) (a subgroup of SU(3

We perform a general analytic study of feasibility of obtaining a combined explanation for the deficits in the solar and the atmospheric neutrino fluxes with two large mixing angles in supersymmetric model with bilinear R parity violations. The required hierarchy among the solar and atmospheric

It is well-known that the radius of the largest ball of separable unnormalized states around the identity matrix is smaller than 1 if the number of subsystems is sufficiently large (Gurvits and Barnum, quant.ph/0409095). However, despite their practical interest no examples of entangled states which are closer than 1 to the identity matrix have been found yet. We present such an example for a 4-qubit system. As a by-product, we compute the radius of the largest ball that fits into the projective tensor product of four unit balls in R 3. 1