Constraining Almost Degenerate Three-Flavor Neutrinos

Abstract

We discuss constraints on a scenario of almost degenerate three-flavor neutrinos imposed by the solar and the atmospheric neutrino anomalies, hot dark matter, and neutrinoless double $\beta$ decays. It is found that in the Majorana version of the model the region with relatively large ${\theta }_{13}$ is favored and a constraint on the CP violating phases is obtained.

Comments: 19 pages (uses revtex), including 6 figures (uses epsf)