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Particle Dark Matter Searches Outside the Local Group

Articolo
Data di Pubblicazione:
2015
Abstract:
If dark matter (DM) is composed by particles which are non-gravitationally coupled to ordinary matter, their annihilations or decays in cosmic structures can result in detectable radiation. We show that the most powerful technique to detect a particle DM signal outside the Local Group is to study the angular cross-correlation of non-gravitational signals with low-redshift gravitational probes. This method allows to enhance signal-to-noise from the regions of the Universe where the DM-induced emission is preferentially generated. We demonstrate the power of this approach by focusing on GeV-TeV DM and on the recent cross-correlation analysis between the 2MASS galaxy catalogue and the Fermi-LAT gamma-ray maps. We show that this technique is more sensitive than other extragalactic gamma-ray probes, such as the energy spectrum and angular autocorrelation of the extragalactic background, and emission from clusters of galaxies. Intriguingly, we find that the measured cross-correlation can be well fitted by a DM component, with thermal annihilation cross section and mass between 10 and 100 GeV, depending on the small-scale DM properties and gamma-ray production mechanism. This solicits further data collection and dedicated analyses.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Regis, Marco; Xia, Jun-Qing; Cuoco, Alessandro; Branchini, Enzo; Fornengo, Nicolao; Viel, Matteo
Autori di Ateneo:
CUOCO Alessandro
FORNENGO Nicolao
REGIS Marco
Link alla scheda completa:
https://iris.unito.it/handle/2318/1531511
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1531511/71944/PhysRevLett.114.241301.pdf
Pubblicato in:
PHYSICAL REVIEW LETTERS
Journal
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URL

http://arxiv.org/abs/1503.05922
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