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16 February 2025
 
  » arxiv » 1109.0095

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Extragalactic gamma-ray signal from Dark Matter annihilation: a power spectrum based computation
Pasquale D. Serpico ; Emiliano Sefusatti ; Michael Gustafsson ; Gabrijela Zaharijas ;
Date 1 Sep 2011
AbstractWe revisit the computation of the extragalactic gamma-ray signal from cosmological dark matter annihilations. The prediction of this signal is notoriously affected by a model dependence, due to different descriptions of the clumpiness of the dark matter distribution at small scales, which yields an enhancement with respect to the smoothly distributed case. We show how a direct computation of this "flux multiplier" in terms of the nonlinear power spectrum offers a conceptually simpler approach and may ease some of the problems, such as the extrapolation issue. In fact very simple analytical recipes to construct the power spectrum yield directly results similar to or better than popular Halo Model expectations. This approach also obviates to the need of identifying (often ill-defined or literature-dependent) auxiliary concepts entering the Halo Model, to compare different simulations.
Source arXiv, 1109.0095
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