Model for Thermal Relic Dark Matter of Strongly Interacting Massive Particles

Yonit Hochberg, Eric Kuflik, Hitoshi Murayama, Tomer Volansky, Jay G. Wacker

Research output: Contribution to journalArticlepeer-review

265 Scopus citations


A recent proposal is that dark matter could be a thermal relic of 3→2 scatterings in a strongly coupled hidden sector. We present explicit classes of strongly coupled gauge theories that admit this behavior. These are QCD-like theories of dynamical chiral symmetry breaking, where the pions play the role of dark matter. The number-changing 3→2 process, which sets the dark matter relic abundance, arises from the Wess-Zumino-Witten term. The theories give an explicit relationship between the 3→2 annihilation rate and the 2→2 self-scattering rate, which alters predictions for structure formation. This is a simple calculable realization of the strongly interacting massive-particle mechanism.

Original languageAmerican English
Article number021301
JournalPhysical Review Letters
Issue number2
StatePublished - 10 Jul 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society. © 2015 American Physical Society.


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