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Over almost all of minimal supergravity (mSUGRA or CMSSM) model parameterspace, there is a large overabundance of neutralino cold dark matter (CDM). Wefind that the allowed regions of mSUGRA parameter space which match themeasured abundance of CDM in the universe are highly fine-tuned. If instead weinvoke the Peccei-Quinn-Weinberg-Wilczek solution to the strong CP problem,then the SUSY CDM may consist of an axion/axino admixture with an axino mass oforder the MeV scale, and where mixed axion/axino or mainly axion CDM seemspreferred. In this case, fine-tuning of the relic density is typically muchlower, showing that axion/axino CDM (a\tilde{a}CDM) is to be preferred in theparadigm model for SUSY phenomenology. For mSUGRA with a\tilde{a}CDM, quitedifferent regions of parameter space are now DM-favored as compared to the caseof neutralino DM. Thus, rather different SUSY signatures are expected at theLHC in the case of mSUGRA with a\tilde{a}CDM, as compared to mSUGRA withneutralino CDM.

Fine-tuning favors mixed axion/axino cold dark matter over neutralinos in the minimal supergravity model