Constraining Decaying Dark Matter

Abstract

We revisited the decaying dark matter (DDM) model, in which one collisionless particle decays early into two collisionless particles, that are potentially dark matter particles today. The effect of DDM will be manifested in the cosmic microwave background (CMB) and structure formation. With a systematic modification of CMB calculation tool \texttt{camb}, we can numerically calculated this effect, and compare it to observations. Further Markov Chain Monte Carlo \texttt{cosmomc} runnings update the constraints in that model: the free streaming length ${\lambda }_{FS}\lesssim 0.5$Mpc for nonrelativistic decay, and $((M_{DDM}/keV)Y{)}^2(T_d/yr)\lesssim 5\times 10^{-5}$ for relativistic decay.

4 pages, 3 figures

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• Super heavy thermal dark matter
• Evolution of perturbations and cosmological constraints in decaying dark matter models with arbitrary decay mass products
• Fractional Dark Matter decay: cosmological imprints and observational constraints
• Matter Power Spectrum of Light Freeze-in Dark Matter: With or without Self-Interaction
• Visualizing Invisible Dark Matter Annihilation with the CMB and Matter Power Spectrum