Self-resonant Dark Matter

Abstract

We present a novel mechanism for Sommerfeld enhancement for dark matter interactions without the need for light mediators. Considering a model for two-component dark matter with a triple coupling, we find that one of dark matter particles leads to an $u$-channel resonance in dark matter elastic scattering. From the sum of the $u$-channel ladder diagrams, we obtain a Bethe-Salpeter equation with a delay term and identify the Sommerfeld factor from the elastic scattering of two dark matter components for the first time. We discuss the implications of our results for enhancing dark matter self-scattering and annihilation.

13 pages, 3 figures, Published version in JHEP

References in corpus (8)

• A Theory of Dark Matter
• Cosmology and Astrophysics of Minimal Dark Matter
• Resonant Dark Forces and Small Scale Structure
• Self-Scattering for Dark Matter with an Excited State
• Vector SIMP dark matter
• Self-interacting Dark Matter Without Direct Detection Constraints
• The Semi-Classical Regime for Dark Matter Self-Interactions
• Effective theory for self-interacting dark matter and massive spin-2 mediators

Cited by in corpus (1)

• Models for Self-resonant Dark Matter