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 1010 GeV, or by the conventional misalignment mechanism for 1011-12 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.
Highlights
B-L B+L a baryon-antibaryon asymmetry via baryon number-violating processes
In this paper we proposed a model in which the baryon asymmetry of the Universe is generated through supersymmetric RPV interactions and the rotation of the axion
The rotational motion is partially transferred via strong sphaleron processes to give a fermion chiral asymmetry
Summary
We review the rotational dynamics of an axion field proposed in [10]. In combination with the QCD anomaly, which explicitly breaks the PQ symmetry and the chiral symmetry of colored particles down to a linear combination of the two, the symmetry is completely broken If this breaking were too strong, the above axion rotation could be washed out and the estimation of the baryon asymmetry would be modified. Because FCNCs are suppressed at high scalar masses, the requirement that washout is avoided can be considered the most stringent bound on squark mixing in this case In deriving this constraint on the mixing and fa, we fixed the PQ charge so that the axion rotation explains axion dark matter as described in the subsection, but the estimation of the washout rates is applicable to a generic PQ charge. Since the flat saxion potential essential for the initiation of the axion rotation is naturally realized in supersymmetric theories, such an analysis is especially welcome
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