Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 441, Issue 3, Pages 1861-1878Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu686
Keywords
cosmology: theory; dark matter; gamma-rays: diffuse background
Categories
Funding
- Belgian Science Policy [IAP VII/37]
- IISN
- ARC
- CONACyT [151234]
- IFUNAM
- Abdus Salam ICTP
Ask authors/readers for more resources
We re-evaluate the extragalactic gamma-ray flux prediction from dark matter annihilation in the approach of integrating over the non-linear matter power spectrum, extrapolated to the free-streaming scale. We provide an estimate of the uncertainty based entirely on available N-body simulation results and minimal theoretical assumptions. We illustrate how an improvement in the simulation resolution, exemplified by the comparison between the Millennium and Millennium II simulations, affects our estimate of the flux uncertainty and we provide a 'best guess' value for the flux multiplier, based on the assumption of stable clustering for the dark matter perturbations described as a collision-less fluid. We achieve results comparable to traditional halo model calculations, but with a much simpler procedure and a more general approach, as it relies only on one, directly measurable quantity. In addition, we discuss the extension of our calculation to include baryonic effects as modelled in hydrodynamical cosmological simulations and other possible sources of uncertainty that would in turn affect indirect dark matter signals. Upper limits on the integrated power spectrum from supernovae lensing magnification are also derived and compared with theoretical expectations.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available