Dark and visible matter with broken R-parity and the axion multiplet

TL;DR

This paper explores how small R-parity breaking in supersymmetry models relaxes cosmological constraints on axions and related particles, making certain spectra viable and linking the strong CP problem to dark matter and baryogenesis.

Contribution

It demonstrates that breaking R-parity alleviates cosmological bounds on the axion multiplet, expanding the parameter space for supersymmetric models with axions.

Findings

Relaxed bounds on axion multiplet spectra due to R-parity breaking.

Late particle decay constraints are surpassed by non-thermal axion production bounds.

Strong CP problem provides additional motivation for broken R-parity.

Abstract

A small breaking of R-parity reconciles thermal leptogenesis, gravitino dark matter and primordial nucleosynthesis. We find that the same breaking relaxes cosmological bounds on the axion multiplet. Naturally expected spectra become allowed and bounds from late particle decays become so weak that they are superseded by bounds from non-thermal axion production. In this sense, the strong CP problem serves as an additional motivation for broken R-parity.