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We revisit the case of scalar dark matter interacting just gravitationallywith the Standard Model (SM) particles in an extra-dimensional Randall-Sundrumscenario. We assume that both, the dark matter and the Standard Model, arelocalized in the TeV brane and only interact via gravitational mediators,namely the graviton Kaluza-Klein modes and the radion. We analyze in detail thedark matter annihilation channel into two on-shell KK-gravitons, and contraryto previous studies which overlooked this process, we find that it is possibleto obtain the correct relic abundance for dark matter masses in the range [1,10] TeV even after taking into account the strong bounds from LHC Run II. Wealso consider the impact of the radion contribution (virtual exchange leadingto SM final states as well as on-shell production), which does notsignificantly change our results. Quite interestingly, a sizeable part of thecurrently allowed parameter space could be tested by LHC Run III and by theHigh-Luminosity LHC.

Gravity-mediated Scalar Dark Matter in Warped Extra-Dimensions