High Energy Physics - Phenomenology
[Submitted on 30 Aug 2021 (v1), last revised 5 Jan 2022 (this version, v2)]
Title:Non-minimally Coupled Vector Boson Dark Matter
View PDFAbstract:We consider a simple abelian vector dark matter (DM) model, where {\it only} the DM $(\widetilde{X}_\mu)$ couples non-minimally to the scalar curvature $(\widetilde{R})$ of the background spacetime via an operator of the form $\sim \widetilde{X}_\mu\,\widetilde{X}^\mu\,\widetilde{R}$. By considering the standard freeze-out scenario, we show, it is possible to probe such a non-minimally coupled DM in direct detection experiments for a coupling strength $\xi\sim\mathcal{O}\left(10^{30}\right)$ and DM mass $m_X\lesssim 55$ TeV, satisfying Planck observed relic abundance and perturbative unitarity. We also discuss DM production via freeze-in, governed by the non-minimal coupling, that requires $\xi\lesssim 10^{-5}$ to produce the observed DM abundance over a large range of DM mass depending on the choice of the reheating temperature. We further show, even in the absence of the non-minimal coupling, it is possible to produce the whole observed DM abundance via 2-to-2 scattering of the bath particles mediated by massless gravitons.
Submission history
From: Basabendu Barman [view email][v1] Mon, 30 Aug 2021 18:03:06 UTC (667 KB)
[v2] Wed, 5 Jan 2022 14:55:43 UTC (1,173 KB)
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