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

Jul 24, 2023
13 pages
Published in:
  • Phys.Rev.D 109 (2024) 8, 083512
  • Published: Apr 11, 2024
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DOI:

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Abstract: (APS)
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 γ-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 γ-ray background, excluding with 95% confidence dark matter annihilation to bb¯ final states for dark matter masses below 120 GeV.
Note:
  • 13 pages, 12 figures; accepted by PRD
  • dark matter: annihilation
  • gamma ray: background
  • dark matter: mass
  • gamma ray: flux
  • density: high
  • GeV
  • GLAST