Precision estimate of cosmological and particle parameters in the decaying-dark-matter hypothesis

I have recently proposed that both H i regions of the Galaxy and Lyman-α clouds are mainly ionized by decaying dark matter. Here I point out that to avoid an excessive metagalactic ionizing flux F, the energy ${\mathit{E}}_{\gamma }$ of the decay photons must be severely constrained. It then follows that the mass ${\mathit{m}}_1$ and lifetime τ of the decaying particles, the flux F, the density ρ and age ${\mathit{t}}_{\mathit{U}}$ of the Universe, Ω (=ρ/${\mathrm{\rho }}_{\mathrm{crit}}$), and the Hubble constant H also have to be severely constrained. The validity of our theory requires that ${\mathit{E}}_{\gamma }$=14.4±0.5 eV, ${\mathit{m}}_1$=28.9±1.1 eV, τ=(2+1)×${10}^{23}$ sec, F=(3.8±2.2)×${10}^5$ ${\mathrm{cm}}^{\mathrm{-}2}$ ${\sec }^{\mathrm{-}1}$, ρ=(6.14±0.26×${10}^{\mathrm{-}30}$ g ${\mathrm{cm}}^{\mathrm{-}3}$, ${\mathit{t}}_{\mathit{U}}$∼1.2×${10}^{10}$yr, Ω∼1, and H=55±1 km ${\sec }^{\mathrm{-}1}$ ${\mathrm{Mpc}}^{\mathrm{-}1}$.