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We present a viable flipped version of the SU(5) model which may be embedded in SO(10) consistent with the phenomenological requirements of having a non-trivial quark mixing matrix, natural doublet-triplet splitting, and a single pair of light electroweak Higgs doublet scalar bosons. In the presence of suitable non-renormalizable superpotential terms the model can reproduce the hierarchy observed...
We consider a left-right symmetric model in which neutrinos acquire mass due to the spontaneous violation of both the gauged B -- L and a global U(1) symmetry broken by the vacuum expectation value (VEV) of a gauge singlet scalar boson σ . For suitable choices of σ consistent with all laboratory and astrophysical observations neutrinos will be unstable against majoron emission. All neutrino...
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