Dynamical Evolution of Gravitational Leptogenesis

Abstract

Radiatively-induced gravitational leptogenesis is a potential mechanism to explain the observed matter-antimatter asymmetry of the universe. Gravitational tidal effects at the quantum loop level modify the dynamics of the leptons in curved spacetime and may be encoded in a low-energy effective action Seff. It has been shown in previous work how in a high-scale BSM theory the CP odd curvature-induced interactions in Seff modify the dispersion relations of leptons and antileptons differently in an expanding universe, giving rise to an effective chemical potential and a non-vanishing equilibrium lepton-antilepton asymmetry. In this paper, the CP even curvature interactions are shown to break lepton number current conservation and modify the evolution of the lepton number density as the universe expands. These effects are implemented in a generalised Boltzmann equation and used to trace the dynamical evolution of the lepton number density in different cosmological scenarios. The theory predicts a potentially significant gravitationally-induced lepton-antilepton asymmetry at very early times in the evolution of the universe.

arXiv comment59 pages, 19 figures. JHEP published version

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Cited by in corpus (6)

• Baryogenesis from the weak scale to the grand unification scale
• Flavour effects in gravitational leptogenesis
• Gravitational charge production
• Probing Leptogenesis and Pre-BBN Universe with Gravitational Waves Spectral Shapes
• A Model of Gravitational Leptogenesis
• Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis: cosmic strings