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arXiv · 2002.12779

Dark matter self-interactions from spin-2 mediators

Yoo-Jin Kang·Hyun Min Lee
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Abstract

We propose a new mechanism for rendering dark matter self-interacting in the presence of a massive spin-2 mediator. The derived Yukawa-type potential for dark matter is independent of the spins of dark matter in the leading order of the momentum expansion, so are the resulting non-perturbative effects for the dark matter self-scattering. We find that both the Born cross section and relatively mild resonance effects assist to make the self-scattering cross section velocity-dependent. We discuss how to evade the current indirect bounds on dark matter annihilations and show that the model is marginally compatible with perturbative unitarity in the ghost-free realization of the massive spin-2 particle.

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Yoo-Jin Kang, Hyun Min Lee. 2020-02-28. Dark matter self-interactions from spin-2 mediators. https://arxiv.org/abs/2002.12779

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