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We explore the phenomenology of Kaluza-Klein (KK) dark matter in very generalmodels with universal extra dimensions (UEDs), emphasizing the complementaritybetween high-energy colliders and dark matter direct detection experiments. Inmodels with relatively small mass splittings between the dark matter candidateand the rest of the (colored) spectrum, the collider sensitivity is diminished,but direct detection rates are enhanced. UEDs provide a natural framework forsuch mass degeneracies. We consider both 5-dimensional and 6-dimensionalnon-minimal UED models, and discuss the detection prospects for various KK darkmatter candidates: the KK photon \gamma_1 (5D) the KK Z-boson Z_1 (5D) and thespinless KK photon \gamma_H (6D). We combine collider limits such aselectroweak precision data and expected LHC reach, with cosmologicalconstraints from WMAP and the sensitivity of current or planned directdetection experiments. Allowing for general mass splittings, we show thatneither colliders, nor direct detection experiments by themselves can exploreall of the relevant KK dark matter parameter space. Nevertheless, they probedifferent parameter space regions and the combination of the two types ofconstraints can be quite powerful. For example, in the case of \gamma_1 in 5DUEDs the relevant parameter space will be almost completely covered by thecombined LHC and direct detection sensitivities expected in the near future.

Kaluza-Klein Dark Matter: Direct Detection vis-a-vis LHC (IDM 2008 proceeding)