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Advances in High Energy Physics
Volume 2012, Article ID 158303, 59 pages
Review Article

Leptogenesis in the Universe

1INFN Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044 Frascati, Italy
2Department of Theoretical Physics, University of Geneva and Center for Astroparticle Physics (CAP), 24 quai E. Ansermet, 1211 Geneva 4, Switzerland

Received 25 June 2012; Accepted 30 October 2012

Academic Editor: Gian Luigi Fogli

Copyright © 2012 Chee Sheng Fong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Leptogenesis is a class of scenarios in which the cosmic baryon asymmetry originates from an initial lepton asymmetry generated in the decays of heavy sterile neutrinos in the early Universe. We explain why leptogenesis is an appealing mechanism for baryogenesis. We review its motivations and the basic ingredients and describe subclasses of effects, like those of lepton flavours, spectator processes, scatterings, finite temperature corrections, the role of the heavier sterile neutrinos, and quantum corrections. We then address leptogenesis in supersymmetric scenarios, as well as some other popular variations of the basic leptogenesis framework.