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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1602.01012 (astro-ph)
[Submitted on 2 Feb 2016]

Title:Constraints on Dark Matter Annihilation/Decay from the Isotropic Gamma-Ray Background

Authors:Wei Liu, Xiao-Jun Bi, Su-Jie Lin, Peng-Fei Yin
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Abstract:In this work we study the constraints on dark matter (DM) annihilation/decay from the Fermi-LAT Isotropic Gamma-Ray Background (IGRB) observation. We consider the contributions from both extragalactic and galactic DM components. For DM annihilation, the evolutions of extragalactic DM halos are taken into account. We find that the IGRB constraints under some DM subhalo models can be comparable to those derived from the observations of dwarf spheroidal galaxies. We also use the IGRB results to constrain the parameter regions accounting for the latest AMS-02 electron-positron anomaly. We find that the majority of DM annihilation/decay channels are strongly disfavored by the latest Fermi-LAT IGRB observation; only DM annihilation/decay to $\mu^+\mu^-$ may be valid.
Comments: 27 pages, 6 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1602.01012 [astro-ph.CO]
  (or arXiv:1602.01012v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1602.01012
Related DOI: https://doi.org/10.1088/1674-1137/41/4/045104

Submission history

From: Wei Liu [view email]
[v1] Tue, 2 Feb 2016 17:11:46 UTC (92 KB)
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