Leptogenesis, neutrino masses and gauge unification

Abstract

Leptogenesis is considered in its natural context where Majorana neutrinos fit in a gauge unification scheme and therefore couple to some extra gauge bosons. The masses of some of these gauge bosons are expected to be similar to those of the heavy Majorana particles, and this can have important consequences for leptogenesis. In fact, the effect can go both ways. Stricter bounds are obtained on one hand due to the dilution of the CP-violating effect by new decay and scattering channels, while, in a re-heating scheme, the presence of gauge couplings facilitates the re-population of the Majorana states. The latter effect allows in particular for smaller Dirac couplings.

11pages, 7 figures. v2: definition of the lepton asymmetry corrected, small numerical changes for the baryon number, conclusion does not change; typos corrected and references added

References in corpus (1)

• Constraints on neutrino masses from leptogenesis models

Cited by in corpus (12)

• A non Supersymmetric SO(10) Grand Unified Model for All the Physics below $M_{GUT}$
• Leptogenesis and Dark Matter related ?
• Is leptogenesis falsifiable at LHC?
• Successful Leptogenesis in SO(10) Unification with a Left-Right Symmetric Seesaw Mechanism
• Leptogenesis with a dynamical seesaw scale
• Leptogenesis and neutral gauge bosons
• Neutrino Masses and Leptogenesis in Type I+II Seesaw Models
• A renormalizable left-right symmetric model with low scale seesaw mechanisms
• Leptogenesis, Z' bosons, and the reheating temperature of the Universe
• Corrections to Scaling Neutrino Mixing: Non-zero ${\theta }_{13},{\delta }_{CP}$ and Baryon Asymmetry
• Gauge dilution in leptogenesis
• Can LHC disprove Leptogenesis ?