R-Parity Violation Axiogenesis

TL;DR

This paper proposes a novel mechanism where axion field rotation, combined with R-parity violating interactions, explains the universe's baryon asymmetry, linking axion physics, supersymmetry, and cosmological observations.

Contribution

It introduces a new baryogenesis scenario involving axion rotation and R-parity violation, with detailed constraints and potential experimental signatures.

Findings

Axion rotation can generate the observed baryon asymmetry.

Parameter space is constrained by nucleosynthesis, proton decay, and dark matter production.

The scenario predicts observable signals in proton decay, axion searches, and gravitational waves.

Abstract

We show that the rotation of the QCD axion field, aided by $B-L$ violation from supersymmetric $R$-parity violating couplings, can yield the observed baryon abundance. Strong sphaleron processes transfer the angular momentum of the axion field into a quark chiral asymmetry, which $R$-parity violating couplings convert to the baryon asymmetry of the Universe. We focus on the case of dimensionless $R$-parity violating couplings with textures motivated by grand unified theories and comment on more general scenarios. The axion decay constant and mass spectrum of supersymmetric particles are constrained by Big Bang nucleosynthesis, proton decay from the $R$-parity violation, and successful thermalization of the Peccei-Quinn symmetry breaking field. Axion dark matter may be produced by the axion rotation via the kinetic misalignment mechanism for axion decay constants below $10^{10}$ GeV, or by the conventional misalignment mechanism for $10^{11-12}$ GeV. The viable parameter region can be probed by proton decay and axion searches. This scenario may also have connections with collider experiments, including searches for long-lived particles, and observations of gravitational waves.