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Title: Constraints on decaying dark matter from the isotropic gamma-ray background

Abstract

If the dark matter is unstable, the decay of these particles throughout the universe and in the halo of the Milky Way could contribute significantly to the isotropic gamma-ray background (IGRB) as measured by Fermi. Here, we calculate the high-latitude gamma-ray flux resulting from dark matter decay for a wide range of channels and masses, including all contributions from inverse Compton scattering and accounting for the production and full evolution of cosmological electromagnetic cascades. We also make use of recent multi-wavelength analyses that constrain the astrophysical contributions to the IGRB, enabling us to more strongly restrict the presence any component arising from decaying dark matter. Lastly, over a wide range of decay channels and masses (from GeV to EeV and above), we derive stringent lower limits on the dark matter's lifetime, generally in the range of τ ~ (1-5)× 10 28 s.}

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1488590
Report Number(s):
arXiv:1811.05988; FERMILAB-PUB-18-627-A
Journal ID: ISSN 1475-7516; 1703761
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 03; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Blanco, Carlos, and Hooper, Dan. Constraints on decaying dark matter from the isotropic gamma-ray background. United States: N. p., 2019. Web. doi:10.1088/1475-7516/2019/03/019.
Blanco, Carlos, & Hooper, Dan. Constraints on decaying dark matter from the isotropic gamma-ray background. United States. doi:10.1088/1475-7516/2019/03/019.
Blanco, Carlos, and Hooper, Dan. Mon . "Constraints on decaying dark matter from the isotropic gamma-ray background". United States. doi:10.1088/1475-7516/2019/03/019.
@article{osti_1488590,
title = {Constraints on decaying dark matter from the isotropic gamma-ray background},
author = {Blanco, Carlos and Hooper, Dan},
abstractNote = {If the dark matter is unstable, the decay of these particles throughout the universe and in the halo of the Milky Way could contribute significantly to the isotropic gamma-ray background (IGRB) as measured by Fermi. Here, we calculate the high-latitude gamma-ray flux resulting from dark matter decay for a wide range of channels and masses, including all contributions from inverse Compton scattering and accounting for the production and full evolution of cosmological electromagnetic cascades. We also make use of recent multi-wavelength analyses that constrain the astrophysical contributions to the IGRB, enabling us to more strongly restrict the presence any component arising from decaying dark matter. Lastly, over a wide range of decay channels and masses (from GeV to EeV and above), we derive stringent lower limits on the dark matter's lifetime, generally in the range of τ ~ (1-5)× 1028 s.}},
doi = {10.1088/1475-7516/2019/03/019},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2019,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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