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Title: Prospects for indirect MeV dark matter detection with gamma rays in light of cosmic microwave background constraints

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1394706
Grant/Contract Number:
SC0010107
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Related Information: CHORUS Timestamp: 2017-09-25 12:31:02; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

González-Morales, Alma X., Profumo, Stefano, and Reynoso-Cordova, Javier. Prospects for indirect MeV dark matter detection with gamma rays in light of cosmic microwave background constraints. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.063520.
González-Morales, Alma X., Profumo, Stefano, & Reynoso-Cordova, Javier. Prospects for indirect MeV dark matter detection with gamma rays in light of cosmic microwave background constraints. United States. doi:10.1103/PhysRevD.96.063520.
González-Morales, Alma X., Profumo, Stefano, and Reynoso-Cordova, Javier. 2017. "Prospects for indirect MeV dark matter detection with gamma rays in light of cosmic microwave background constraints". United States. doi:10.1103/PhysRevD.96.063520.
@article{osti_1394706,
title = {Prospects for indirect MeV dark matter detection with gamma rays in light of cosmic microwave background constraints},
author = {González-Morales, Alma X. and Profumo, Stefano and Reynoso-Cordova, Javier},
abstractNote = {},
doi = {10.1103/PhysRevD.96.063520},
journal = {Physical Review D},
number = 6,
volume = 96,
place = {United States},
year = 2017,
month = 9
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 25, 2018
Publisher's Accepted Manuscript

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  • If dark matter decays to electromagnetically interacting particles, it can inject energy into the baryonic gas and thus affect the processes of recombination and reionization. This leaves an imprint on the cosmic microwave background (CMB): the large-scale polarization is enhanced, and the small-scale temperature fluctuation is damped. We use the Wilkinson Microwave Anisotropy Probe (WMAP) three-year data combined with galaxy surveys to constrain radiatively decaying dark matter. Our new limits to the dark-matter decay width are about 10 times stronger than previous limits. For dark-matter lifetimes that exceed the age of the Universe, a limit of {zeta}{gamma}{sub {chi}}<1.7x10{sup -25} s{supmore » -1} (95% C.L.) is derived, where {zeta} is the efficiency of converting decay energy into ionization energy. Limits for lifetimes short compared with the age of the Universe are also derived. We forecast improvements expected from the Planck satellite.« less
  • We update a previous investigation of cosmological effects of a nonstandard interaction between neutrinos and dark matter. Parametrizing the elastic-scattering cross section between the two species as a function of the temperature of the Universe, the resulting neutrino-dark matter fluid has a nonzero pressure, which determines diffusion-damped oscillations in the matter power spectrum similar to the acoustic oscillations generated by the photon-baryon fluid. Using cosmic microwave background data in combination with large scale structure experiment results, we then put constraints on the fraction of the interacting dark matter component as well as on the corresponding opacity.
  • If a component of cosmological dark matter is made up of massive particles-such as sterile neutrinos-that decay with cosmological lifetime to emit photons, the reionization history of the universe would be affected, and cosmic microwave background anisotropies can be used to constrain such a decaying particle model of dark matter. The optical depth depends rather sensitively on the decaying dark matter particle mass m{sub dm}, lifetime {tau}{sub dm}, and the mass fraction of cold dark matter f that they account for in this model. Assuming that there are no other sources of reionization and using the Wilkinson Microwave Anisotropy Probemore » 7-year data, we find that 250 eV {approx}< m{sub dm} {approx}< 1 MeV, whereas 2.23 Multiplication-Sign 10{sup 3} yr {approx}< {tau}{sub dm}/f {approx}< 1.23 Multiplication-Sign 10{sup 18} yr. The best-fit values for m{sub dm} and {tau}{sub dm}/f are 17.3 keV and 2.03 Multiplication-Sign 10{sup 16} yr, respectively.« less
  • We show, by using an extensive sample of viable supersymmetric models as templates, that indirect detection of dark matter through gamma rays may have a large potential for identifying the nature of dark matter. This is, in particular, true also for models that give too weak dark matter-nucleon scattering cross sections to be probed by present and planned direct detection experiments. Also models with a mass scale too high to be accessible at CERN's LHC accelerator may show up in next-generation imaging Cherenkov telescope arrays. Based on our findings, we therefore suggest to view indirect searches as genuine particle physicsmore » experiments, complementing other strategies to probe so far unknown regions in the parameter space of e.g. supersymmetric models, and propose a new approach that would make use of telescopes dedicated for dark matter searches. As a concrete example for the potential of such an approach, we consider an array of imaging air Cherenkov telescopes, the Dark Matter Array (DMA), and show that such an experiment could extend present-day limits by several orders of magnitude, reaching a large class of models that would remain undetected in both direct detection experiments and searches at the LHC. In addition, in a sizable part of the parameter space, signals from more than one type of dark matter detection experiment would be possible, something that may eventually be necessary in order to identify the dark matter candidate.« less