Constraining Almost Degenerate Three-Flavor Neutrinos

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 $β$ decays. It is found that in the Majorana version of the model the region with relatively large $θ_{13}$ is favored and a constraint on the CP violating phases is obtained.

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