Sommerfeld Enhancement and Gamma-Ray Excess
Analysis
Key Takeaways
- •The paper explores the Sommerfeld enhancement as a possible explanation for the gamma-ray excess.
- •It proposes a model with a light scalar mediator.
- •The model is consistent with thermal freeze-out, the Milky Way excess, and dwarf spheroidal galaxy constraints.
“A minimal model with a light CP-even scalar mediator naturally produces a velocity-dependent annihilation cross section consistent with thermal freeze-out, the Milky Way excess, and limits from dwarf spheroidal galaxies.”