The SIMPlest Miracle

Abstract

It has recently been proposed that dark matter could be a thermal relic of 3-to-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-to-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-to-2 annihilation rate and the 2-to-2 self-scattering rate, which alters predictions for structure formation. This is a simple calculable realization of the strongly-interacting-massive-particle (SIMP) mechanism.

8 pages, 2 figures; v2: published in PRL under the title "Model for thermal relic dark matter of strongly interacting massive particles"

References in corpus (9)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Constraints on the Self-Interaction Cross-Section of Dark Matter from Numerical Simulations of the Merging Galaxy Cluster 1E 0657-5
• The SIMP Miracle
• Self-Interacting Dark Matter from a Non-Abelian Hidden Sector
• Ultra Minimal Technicolor and its Dark Matter TIMP
• Dark Nuclei I: Cosmology and Indirect Detection
• SIMPle Dark Matter: Self-Interactions and keV Lines
• Dark Nuclei II: Nuclear Spectroscopy in Two-Colour QCD
• Glueballs and the superfluid phase of Two-Color QCD

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