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Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
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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.
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The dark matter halo mass function in the $\Lambda\mathrm{CDM}$ cosmology at all times and over all scales -- from planetary to galaxy cluster masses
A Reed-based fitting formula for the ΛCDM halo mass function, accurate to a few percent from 10^{-6} to 10^{15.5} M_⊙ and z=0–30, obtained via nested VVV simulations plus a new subsampling reconstruction.
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