Baryogenesis

Developments in understanding of baryogenesis are reviewed. We start with e arly motivations and the proposals in the context of GUTs. Next, the import ance of the sphaleron solution and its implications are discussed. Studies of the Standard Model reveal that the latter has a Higgs structure incompat ible with existence of observed B asymmetry. We then discuss a generic scen ario for electroweak baryogenesis relying on bubble wall dynamics. We also summarise the status of the MSSM, and alternative scenarios utilising topol ogical defects as the source of non-equilibrium behaviour and leptogenesis.