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Dynamical evolution of gravitational leptogenesis

Jamie I. McDonald, Graham Shore

Journal of High Energy Physics, Volume: 2020, Issue: 10

Swansea University Author: Graham Shore

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DOI (Published version): 10.1007/jhep10(2020)025

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 actio...

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Published in: Journal of High Energy Physics
ISSN: 1126-6708 1029-8479
Published: Springer-Nature for SISSA, Trieste, Italy. Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55475
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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.
Keywords: Cosmology of Theories beyond the SM, Eective Field Theories
College: Faculty of Science and Engineering
Issue: 10

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