Structure Formation with a Decaying Mev Tau Neutrino and a Kev Majoron

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We consider the scenario of large scale structure formation with tau neutrino with mass in the MeV range and lifetime of order of years which decays into a massive majoron with KeV mass. The latter are the present-day cold dark matter particles. In contrast to the usual collisionless dark matter, the majorons have a relatively strong self-interaction and the picture of structure formation is rather different from the standard. The decay J γγ leads to the existence of an X-ray line at Eγ= mⱼ/2 which could be detectable. Electron and muon neutrinos are expected to be very light, as required in order to account for the solar neutrino deficit through ≠ to oscillations. Supersymmetry with spontaneously broken R parity provides a natural particle physics model for our scenario.