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- W102743505 abstract "The pregalactic medium may have been ionized by UV photons resulting from the decay of dark matter particles. The implications of such a hypothesis are explored. In a specific model involving decaying neutrinos, it is found that, after recombination at z ⇒ 1000, the fractional ionization gradually increases with time until the medium becomes fully ionized at z i ⇒ 25, for Ω b ⇒ 0.1. The optical depth back to z ⇒ z i is less than unity; beyond z i it increases only as ∼(1+z) 1/4 , so that the last scattering surface is at z * ⇒400. The implications for galaxy formation of this unusual thermal history are briefly described. The predicted small-angular-scale microwave background anisotropies are below current upper limits, provided that the amplitude of the initial fluctuations is adjusted to match the presently-observed clustering" @default.
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- W102743505 date "1991-10-01" @default.
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- W102743505 title "Dark matter decay, reionization and microwave background anisotropies" @default.
- W102743505 hasPublicationYear "1991" @default.
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