2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186610We discuss some cosmological implications of low energy gauged B-L symmetry with and without supersymmetry. Generic possibility of leptogenesis from a domain wall driven first order phase transition is shown to be a characteristic of such models.6 pages. Talk given at IWTHEP 2007, IIT RoorkeeHigh Energy Physics - Phenomenologytext