In natural supersymmetry with discrete R-symmetries, R-parity violation at the 1e-7 level can make the lightest supersymmetric particle decay before nucleosynthesis, leaving only axion dark matter, and LHC non-observation constrains such couplings.
Cosmological Implications of Radiatively Generated Axion Scale
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abstract
We study cosmological implications of supersymmetric axion models in which the axion scale is generated radiatively. Such models lead to the so-called thermal inflation and subsequent reheating should be constrained not to yield a too large axion energy density at the time of nucleosynthesis. We examine how plausible it is that this nucleosynthesis constraint is satisfied for both hadronic and Dine-Fischler-Srednicki-Zhitnitskii type axion models. Baryogenesis and the possibility for raising up the cosmological upper bound on the axion scale in thermal inflation scenario are also discussed.
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Aspects of the WIMP quality problem and R-parity violation in natural supersymmetry with all axion dark matter
In natural supersymmetry with discrete R-symmetries, R-parity violation at the 1e-7 level can make the lightest supersymmetric particle decay before nucleosynthesis, leaving only axion dark matter, and LHC non-observation constrains such couplings.