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Title: General constraints on dark matter decay from the cosmic microwave background

Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
SC00012567; SC0013999
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-02-01 10:44:35; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Slatyer, Tracy R., and Wu, Chih-Liang. General constraints on dark matter decay from the cosmic microwave background. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.023010.
Slatyer, Tracy R., & Wu, Chih-Liang. General constraints on dark matter decay from the cosmic microwave background. United States. doi:10.1103/PhysRevD.95.023010.
Slatyer, Tracy R., and Wu, Chih-Liang. Mon . "General constraints on dark matter decay from the cosmic microwave background". United States. doi:10.1103/PhysRevD.95.023010.
title = {General constraints on dark matter decay from the cosmic microwave background},
author = {Slatyer, Tracy R. and Wu, Chih-Liang},
abstractNote = {},
doi = {10.1103/PhysRevD.95.023010},
journal = {Physical Review D},
number = 2,
volume = 95,
place = {United States},
year = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.95.023010

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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
  • Cited by 1
  • We revisit cosmic microwave background (CMB) constraints on primordial black hole dark matter. Spectral distortion limits from COBE/FIRAS do not impose a relevant constraint. Planck CMB anisotropy power spectra imply that primordial black holes with m {sub BH}∼> 5 M {sub ⊙} are disfavored. However, this is susceptible to sizeable uncertainties due to the treatment of the black hole accretion process. These constraints are weaker than those quoted in earlier literature for the same observables.