Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-11-27
Int.J.Mod.Phys.A11:5541-5568,1996
Astronomy and Astrophysics
Astrophysics
Plain Tex, 6 pages. Contribution to the 12th Italian Conference on General Relativity and Gravitational Physics. Figures on re
Scientific paper
10.1142/S0217751X96002546
In this paper I will discuss the possibility of a reionization of the Universe due to the photons emitted by evaporating primordial black holes (PBHs); this process should happen during the last stages of the PBHs life, when the particle emission is very intense. I will study the time evolution of the ionization degree x, of the plasma temperature $T_{e}$ and of the photon number density $n_{\gamma}$ characterizing the Universe after the recombination epoch: a system of coupled differential equations for these variables is solved in an analytical way by assuming, as a photon source, PBHs having an initial mass $M\sim 10^{14}$ g. The results I obtain prove that such a kind of reionization is possible, being able to increase the ionization degree of the Universe from a value x=0.002 (just after the recombination) to values near 1 (when the black holes evaporation ends).
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