2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139741Thermal leptogenesis, that can be viewed as a consequence of the seesaw model, is a very natural mechanism to explain the matter anti-matter asymmetry of the Universe. Recently, lepton flavours have been included in the Boltzmann equations, modifying significantly the evaluation of the efficiency of leptogenesis to explain the observed baryon asymmetry.4 pages, talk given at the XLIInd Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, March 10 to 17, 2007High Energy Physics - Phenomenologytext