# Dark matter in the Randall-Sundrum model with non-universal coupling

## TL;DR

This paper explores non-universal coupling models of dark matter interacting via KK gravitons in a Randall-Sundrum framework, identifying parameter spaces compatible with relic density and experimental constraints.

## Contribution

It introduces top-philic and lepto-philic graviton models with non-universal couplings, extending to various dark matter spins, and analyzes their viability against experimental data.

## Key findings

- Large parameter space consistent with relic density
- Models evade current LHC constraints
- Compatibility with direct and indirect detection results

## Abstract

We consider simplified dark matter models (DM) interacting gravitationally with the standard model (SM) particles in a Randall-Sundrum (RS) framework. In this framework, the DM particles interact through the exchange of spin-2 Kaluza-Klein (KK) gravitons in the $s$-channel with the SM particles. The parameter space of the RS model with universal couplings to SM particles is known to be strongly constrained from the LHC data. We are thus led to consider models with non-universal couplings. The first model we consider in this study is a top-philic graviton model in which only the right-handed top quarks are taken to interact strongly with the gravitons. In the second, the lepto-philic model, we assume that only the right-handed charged leptons interact strongly with the gravitons. We extend the study to include not only the scalar, vector and spin-1/2 fermions but also spin-3/2 fermionic dark matter. We find that there is a large parameter space in these benchmark models where it is possible to achieve the observed relic density consistent with the direct and indirect searches and yet not to be constrained from the LHC data.