Supergravity can reconcile dark matter with lepton number violating neutrino masses
Abstract
Supersymmetry offers a cold dark matter candidate, provided that lepton number is not violated by an odd number of units. On the other hand, lepton number violation by even (two) units gives us an attractive mechanism of neutrino mass generation. Here we offer an explanation of this, in a supergravity framework underlying a supersymmetric scenario, the essential feature being particles carrying lepton numbers, which interact only gravitationally with all other known particles. It is shown that one can have the right amount of L = 2 effect giving rise to neutrino masses, whereas the lifetime for L = 1 decays of the lightest supersymmetric particle can be prolonged beyond the present age of the universe.
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