Aspects of Sommerfeld Enhancement in the light of Halo gamma-ray excess
Yongsoo Jho, Jeonghwan Park, Min Gi Park, Seong Chan Park
TL;DR
This paper investigates how Sommerfeld enhancement in dark matter annihilation could explain the gamma-ray excess observed near 20 GeV, proposing a minimal model with a light scalar mediator that aligns with various astrophysical constraints.
Contribution
It introduces a minimal dark matter model with a light scalar mediator that naturally accounts for the gamma-ray excess through velocity-dependent annihilation.
Findings
The model produces a velocity-dependent cross section consistent with thermal freeze-out.
It explains the gamma-ray excess near 20 GeV.
It satisfies limits from dwarf spheroidal galaxies.
Abstract
We examine Sommerfeld enhancement in dark matter annihilation as a potential origin of the halo-like gamma-ray excess near 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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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Astrophysics and Cosmic Phenomena · Particle physics theoretical and experimental studies