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 E_γ of the decay photons must be severely constrained. It then follows that the mass m₁ and lifetime τ of the decaying particles, the flux F, the density ρ and age t_U of the Universe, Ω (=ρ/ρ_crit), and the Hubble constant H also have to be severely constrained. The validity of our theory requires that E_γ=14.4±0.5 eV, m₁=28.9±1.1 eV, τ=(2+1)×10²³ sec, F=(3.8±2.2)×10⁵ cm^-2 sec^-1, ρ=(6.14±0.26×10^-30 g cm^-3, t_U∼1.2×10¹⁰yr, Ω∼1, and H=55±1 km sec^-1 Mpc^-1.