Contraints on radiative dark-matter decay from the cosmic microwave background

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dc.creatorZhang, Le
dc.creatorChen, Xuelei
dc.creatorKamionkowski, Marc
dc.creatorSi, Zongguo
dc.creatorZheng, Zheng
dc.date2007-04-19
dc.date2007-09-28
dc.date.accessioned2026-07-07T11:20:19Z
dc.date.available2026-07-07T11:20:19Z
dc.descriptionIf 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 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 ten times stronger than previous limits. For dark-matter lifetimes that exceed the age of the Universe, a limit of $ζΓ_χ < 1.7 \times 10^{-25} s^{-1}$ (95% CL) is derived, where $ζ$ 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.
dc.descriptionreplaced with version published on PRD
dc.identifierhttps://arxiv.org/abs/0704.2444
dc.identifierhttp://arxiv.org/abs/0704.2444
dc.identifierPhys.Rev.D76:061301,2007
dc.identifierdoi:10.1103/PhysRevD.76.061301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193923
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleContraints on radiative dark-matter decay from the cosmic microwave background
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