R-Parity Violation Axiogenesis

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.

Axion dark matter from frictional misalignment

“…The present work also contributes to the larger effort in the community to explore the different possibilities for the cosmological axion evolution which open up once the assumptions of the canonical misalignment picture are relaxed or modified. Indeed, a variety of such scenarios have been proposed in the literature, e. g., large [43][44][45][46] or small [47][48][49][50] misalignment angles, parametric resonance [51][52][53], kinetic misalignment mechanism [39,[54][55][56][57][58][59][60][61][62][63], trapped misalignment [64], axion fragmentation [65][66][67], varying axion decay constant [68], interaction with monopoles [69,70] or modifications in the cosmological history of the Universe [71,72], including entropy injection [12,73,74] or non-standard inflation scenarios [75][76][77][78][79][80].…”