# Gravity-mediated Scalar Dark Matter in Warped Extra-Dimensions

## TL;DR

This paper explores scalar dark matter in a warped extra-dimensional model, showing that gravitational interactions via KK-gravitons can produce the correct relic abundance for TeV-scale masses, with testable predictions for future collider experiments.

## Contribution

It demonstrates that dark matter annihilation into KK-gravitons can account for relic abundance in Randall-Sundrum models, including the impact of radion and collider constraints.

## Key findings

- Dark matter masses in 1-10 TeV range can yield correct relic abundance.
- KK-graviton mediated annihilation is a key process overlooked previously.
- Parameter space is testable by LHC Run III and HL-LHC.

## Abstract

We revisit the case of scalar dark matter interacting just gravitationally with the Standard Model (SM) particles in an extra-dimensional Randall-Sundrum scenario. We assume that both, the dark matter and the Standard Model, are localized in the TeV brane and only interact via gravitational mediators, namely the graviton Kaluza-Klein modes and the radion. We analyze in detail the dark matter annihilation channel into two on-shell KK-gravitons, and contrary to previous studies which overlooked this process, we find that it is possible to 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. We also consider the impact of the radion contribution (virtual exchange leading to SM final states as well as on-shell production), which does not significantly change our results. Quite interestingly, a sizeable part of the currently allowed parameter space could be tested by LHC Run III and by the High-Luminosity LHC.