Radiatively-induced gravitational leptogenesis

TL;DR

This paper shows how gravitational effects in curved spacetime can induce matter-antimatter asymmetry through loop effects, leveraging C and CP violation in BSM theories, and generating a curvature-dependent chemical potential for leptons.

Contribution

It introduces a novel mechanism for leptogenesis driven by gravitational backgrounds and quantum loop effects, connecting curvature to matter-antimatter asymmetry in equilibrium.

Findings

Loop effects cause matter-antimatter propagation differences in curved spacetime.

A curvature-dependent chemical potential for leptons is generated.

Matter-antimatter asymmetry can arise in equilibrium below the BSM scale.

Abstract

We demonstrate how loop effects in gravitational backgrounds lead to a difference in the propagation of matter and antimatter, and show this is forbidden in flat space due to CPT and translation invariance. This mechanism, which is naturally present in beyond the standard model (BSM) theories exhibiting C and CP violation, generates a curvature-dependent chemical potential for leptons in the low-energy effective Lagrangian, allowing a matter-antimatter asymmetry to be generated in thermodynamic equilibrium, below the BSM scale.