Spin-dependence of Gravity-mediated Dark Matter in Warped Extra-Dimensions

We study the spin-dependence of Dark Matter (DM) particles which interact gravitationally with the Standard Model (SM) in an extra-dimensional Randall-Sundrum scenario. We assume that both the Dark Matter and the Standard Model are confined to the TeV (Infra-red) brane and only interact via gravitat...

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Veröffentlicht in:arXiv.org 2021-03
Hauptverfasser: Folgado, Miguel G, Donini, Andrea, Rius, Nuria
Format: Artikel
Sprache:eng
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Zusammenfassung:We study the spin-dependence of Dark Matter (DM) particles which interact gravitationally with the Standard Model (SM) in an extra-dimensional Randall-Sundrum scenario. We assume that both the Dark Matter and the Standard Model are confined to the TeV (Infra-red) brane and only interact via gravitational mediators, namely Kaluza-Klein gravitons and the radion. We analyze the different DM annihilation channels and find that it is possible to achieve the presently observed relic abundance of Dark Matter, \(\Omega_{\rm DM}\), within the freeze-out mechanism for DM particles of spin 0, 1/2 and 1. We study the region of the model parameter space for which \(\Omega_{\rm DM}\) is achieved and compare it with the different experimental and theoretical bounds. We also consider the impact of the radion in the phenomenology. We find that, for DM particles mass \(m_{\rm DM} \in [1,15]\) TeV, most of the parameter space is excluded by the current constraints or will be excluded by the LHC Run III or by the LHC upgrade, the HL-LHC. The presence of the radion does not modify significantly the non-excluded region. The observed DM relic abundance can still be achieved for DM masses \(m_{\rm } \in [4,15]\) TeV and \(m_{G_1} < 10\) TeV for scalar and vector boson Dark Matter. On the other hand, for spin 1/2 fermion Dark Matter, only a tiny region with \(m_{\rm DM } \in [4, 15]\) TeV, \(m_{G_1} \in [5,10]\) TeV and \(\Lambda > m_{G_1}\) is compatible with theoretical and experimental bounds.
ISSN:2331-8422
DOI:10.48550/arxiv.2006.02239