Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background

Abstract

Recent studies indicate that thermally produced dark matter will form highly concentrated, low-mass cusps in the early universe that often survive until the present. While these cusps contain a small fraction of the dark matter, their high density significantly increases the expected gamma-ray flux from dark matter annihilation, particularly in searches of large angular regions. We utilize 14 years of Fermi-LAT data to set strong constraints on dark matter annihilation through a detailed study of the isotropic gamma-ray background, excluding with 95% confidence dark matter annihilation to $b\bar{b}$ final states for dark matter masses below 120 GeV.

arXiv comment13 pages, 12 figures; accepted by PRD

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• Probing superheavy dark matter through lunar radio observations of ultrahigh-energy neutrinos and the impacts of neutrino cascades
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• Limits on Early Matter Domination from the Isotropic Gamma-Ray Background
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• Prompt cusps in hierarchical dark matter halos: Implications for annihilation boost