Baryogenesis through leptogenesis

Abstract

Baryogenesis by heavy-neutrino decay and sphaleron reprocessing of both baryon and lepton number is reconsidered, paying special attention to the flavour structure of the general evolution equations and developing an approximate but sufficiently accurate analytic solution to the prototype evolution equation. Two different models of neutrino masses are examined, based on an Abelian U(1) or a non-Abelian U(2) family symmetry. We show that a consistent picture of baryogenesis can emerge in both cases, although with significant differences.

14 pages. v4: revised using the corrected Boltzmann equations of hep-ph/0310123

References in corpus (2)

• Production of Massive Fermions at Preheating and Leptogenesis
• Neutrino mixings from a U(2) flavour symmetry

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