Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements

Abstract

We consider scenario of the dark matter consisting of two fractions, stable part being dominant and a smaller unstable fraction, which has decayed after the recombination epoch. It has been suggested in Ref. [arxiv:1505.03644] that the above scenario may alleviate tension between high-redshift (CMB anisotropy) and low-redshift (cepheid variables and SNe Ia, cluster counts) cosmological measurements. We derive constraints on the heavy relics branching to $q\bar{q}$, $e^{+}{e}^{-}$, ${\mu }^{+}{\mu }^{-}$, ${\tau }^{+}{\tau }^{-}$, ${\nu }_e\overline{{\nu }_e}$, ${\nu }_{\mu }\overline{{\nu }_{\mu }}$, $W^{+}{W}^{-}$ and $\gamma \gamma$ in the above scenario by comparison of the secondary $\gamma$ and $\nu$ fluxes produced by the process with recent diffuse $\gamma$ and $\nu$ flux measurements.

9 pages, 5 figures

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• Dark Matter Spectra from the Electroweak to the Planck Scale
• Shimmering gravitons in the gamma-ray sky