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

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 Naturally expected spectra become allowed and bounds from late particle decays become so weak that they are superseded by bounds from non-thermal axion production.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.

Comments: 13 pages + refs, 1 table, v2: refs added, minor changes in presentation, v3: refs added, added discussion of decays into Higgs and Higgsino, matches published version