Cosmic microwave background constraints of decaying dark matter particle properties

S. YEUNG, Man Ho CHAN, M.-C. CHU

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7 Citations (Scopus)

Abstract

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 mdm, lifetime τdm, 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 Probe 7-year data, we find that 250eV ≲ mdm ≲ 1 MeV, whereas 2.23 × 10³ yr ≲ τdm/f ≲ 1.23 × 10¹⁸ yr. The best-fit values for mdm and τdm/f are 17.3 keV and 2.03 × 10¹⁶ yr, respectively. Copyright © 2012 The American Astronomical Society. All rights reserved.
Original languageEnglish
Article number108
JournalAstrophysical Journal
Volume755
Issue number2
DOIs
Publication statusPublished - Aug 2012

Fingerprint

dark matter
microwaves
anisotropy
life (durability)
Microwave Anisotropy Probe
particle mass
optical thickness
optical depth
neutrinos
universe
probe
histories
microwave
particle
photons
decay
history

Citation

Yeung, S., Chan, M. H., & Chu, M.-C. (2012). Cosmic microwave background constraints of decaying dark matter particle properties. Astrophysical Journal, 755. Retrieved from https://doi.org/10.1088/0004-637X/755/2/108

Keywords

  • Cosmic background radiation
  • Dark ages
  • Reionization
  • First star
  • Dark matter