Publication: Gravitational leptogenesis from metric perturbations
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2023-02-27
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Amer Physical Soc
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Abstract
In this work, we make the observation that the gravitational leptogenesis mechanism can be implemented without invoking new axial couplings in the inflaton sector. We show that, in the perturbed Robertson-Walker background emerging after inflation, the spacetime metric itself breaks parity symmetry and generates a nonvanishing Pontryagin density which can produce a matter-antimatter asymmetry. We analyze the produced asymmetry in different inflationary and reheating scenarios. We show that the generated asymmetry can be locally comparable to observations in certain cases, although the size of the matter-antimatter regions is typically much smaller than the present Hubble radius.
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© 2023 American Physical Society
We thank Sharma Ramkishor for helpful suggestions. We also thank the Physical Review referees for their insightful comments. This work has been supported by the MINECO (Spain) Project No. PID2019-107394 GB-I00 (AEI/Fondo Europeo de Desarrollo Regional, Union Europea) . A. D. M. acknowledges financial support by the MICIU (Spain) through Formacion de Profesorado Universitario (FPU) Fellowship No. FPU18/04599.