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If one simultaneously invokes the SUSY solution to the gauge hierarchyproblem and the PQ solution to the strong CP problem, then one might expectmixed axion/neutralino dark matter (DM), i.e. two dark matter particles. Inthis case, dark matter production involves oscillation production of axions,thermal and non-thermal neutralino production and thermal and non-thermalproduction of axinos and saxions. The latter particles may feed additionalneutralinos into the cosmic soup, or dilute all relics via additional entropyproduction, or feed dark radiation into the cosmos. Depending on the SUSY andPQ model, the PQ scale can easily exist from 10^9-10^{16} GeV. Axions may liewell beyond the range currently being probed by experiment. In the case ofrelic WIMPs, theoretical predictions must be rescaled for the possibility thatWIMPs only comprise a fraction of the local DM abundance.

Implications of mixed axion/neutralino dark matter for the Cosmic Frontier: a Snowmass whitepaper