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

Published 31 Dec 2025 in hep-ph and astro-ph.HE | (2512.24662v1)

Abstract: We examine Sommerfeld enhancement in dark matter annihilation as a potential origin of the halo-like gamma-ray excess near $E_γ\simeq 20$ 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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