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

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.

Massive spin-2 scattering amplitudes in extra-dimensional theories

“…These extra-dimensional models are being probed by the LHC [8], where we can search for TeV scale KK excitations as a signature of physics beyond the Standard Model. Extra-dimensional theories that additionally incorporate neutral stable matter motivate certain dark matter models, where particulate dark matter interacts with the Standard Model through a massive spin-2 mediator (see, for example, [9][10][11][12][13][14][15]). 1 The extra-dimensional gravitational action in these models gives rise to interactions between the massive spin-2 KK resonances.…”

Unitarity Bounds on the Massive Spin-2 Particle Explanation of Muon $g-2$ Anomaly

“…In Ref. [8], we have demonstrated that the muon g − 2 anomaly can be explained by the one-loop effects induced by a new spin-2 particle G, which can be identified as the first Kaluza-Klein (KK) graviton in the generalized Randall-Sundrum (RS) model [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. By calculating all relevant one-loop Feynman diagrams, we have obtained the analytic expression of the leading-order G-induced contribution to the muon g − 2, which is shown to maintain both the gauge invariance of the quantum electrodynamics and the correct divergence structure of loop integrals.…”

FIMP Dark Matter in Clockwork/Linear Dilaton extra-dimensions

“…Gravity-mediated DM WIMP's (i.e., stable or cosmologically long-lived weakly interactive massive particle, with mass typically in the range 100-1000 GeV, and whose relic abundance is set via the freeze-out mechanism) have been studied mainly in the framework of the RS scenario [12][13][14][15][16][17][18][19][20][21], with generic spin-2 mediators [22][23][24][25] and in the context of the CW/LD model [26].…”