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

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

2007-04-19

arxiv.org/abs/0704.2444v2

Phys.Rev.D76:061301,2007

Astronomy and Astrophysics

Astrophysics

replaced with version published on PRD

Scientific paper

10.1103/PhysRevD.76.061301

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 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 $\zeta \Gamma_{\chi} < 1.7 \times 10^{-25} s^{-1}$ (95% CL) 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.

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