Strongly interacting massive particles through the axion portal

Yonit Hochberg, Eric Kuflik, Robert McGehee, Hitoshi Murayama, Katelin Schutz

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68 Scopus citations


Dark matter could be a thermal relic comprised of strongly interacting massive particles (SIMPs), where 3→2 interactions set the relic abundance. Such interactions generically arise in theories of chiral symmetry breaking via the Wess-Zumino-Witten term. In this work, we show that an axionlike particle can successfully maintain kinetic equilibrium between the dark matter and the visible sector, allowing the requisite entropy transfer that is crucial for SIMPs to be a cold dark matter candidate. Constraints on this scenario arise from beam dump and collider experiments, from the cosmic microwave background, and from supernovae. We find a viable parameter space when the axionlike particle is close in mass to the SIMP dark matter, with strong-scale masses of order a few hundred MeV. Many planned experiments are set to probe the parameter space in the near future.

Original languageAmerican English
Article number115031
JournalPhysical Review D
Issue number11
StatePublished - 1 Dec 2018

Bibliographical note

Publisher Copyright:
© 2018 authors. Published by the American Physical Society.


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