Abstract. We address the question whether low-scale gravity alone can generate the neutrino mass matrix needed to accommodate the observed phenomenology. In low-scale gravity the neutrino mass matrix in the flavor basis is characterized by one parameter (the gravity scale M_X) and by an exact or approximate flavor blindness (namely, all elements of the mass matrix are of comparable size). Neutrino masses and mixings are consistent with the observational data for certain values of the matrix elements, but only when the spectrum of mass is inverted or degenerate. For the latter type of spectra the parameter M_ee probed in double beta experiments and the mass parameter probed by cosmology are close to existing upper limits.

Key words: Solar and Atmospheric Neutrinos; Neutrino Physics; Beyond Standard Model

E-print number: hep-ph/0401029
Cited: by
Refers: to

Received 30 July 2004, accepted for publication 16 April 2005
Published 28 April 2005