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arXiv · 2512.24662

Aspects of Sommerfeld Enhancement in the light of Halo gamma-ray excess

Yongsoo Jho·Jeonghwan Park·Min Gi Park·Seong Chan Park
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Abstract

We examine Sommerfeld enhancement in dark matter annihilation as a potential origin of the halo-like gamma-ray excess near $E_\gamma \simeq 20$ GeV reported by Totani. 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.

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Yongsoo Jho, Jeonghwan Park, Min Gi Park, Seong Chan Park. 2025-12-31. Aspects of Sommerfeld Enhancement in the light of Halo gamma-ray excess. https://arxiv.org/abs/2512.24662

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