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Article overview
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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