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arXiv · 2507.21218

Radion Portal Freeze-Out Dark-Matter

R. Sekhar Chivukula·Joshua A. Gill·Kenn S. Goh·Kirtimaan A. Mohan·George Sanamyan·Dipan Sengupta·Elizabeth H. Simmons·Xing Wang
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Abstract

We show that, in a consistent model of a stabilized extra-dimensional theory, the radion can serve as a natural portal between ordinary matter and WIMP dark matter. With an effective coupling scale of the Kaluza-Klein theory of 20-100 TeV, the radion portal can produce the observed relic abundance through resonant annihilation for dark matter masses up to a TeV. Existing and planned direct dark matter detection experiments cannot constrain this model. However, indirect detection limits exclude dark matter masses between 5 and 80 GeV, where the radion mediator primarily decays into b-quarks.

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R. Sekhar Chivukula, Joshua A. Gill, Kenn S. Goh, Kirtimaan A. Mohan, George Sanamyan, Dipan Sengupta, Elizabeth H. Simmons, Xing Wang. 2025-07-28. Radion Portal Freeze-Out Dark-Matter. https://arxiv.org/abs/2507.21218

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