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Dynamical equation for the degree of ionization of the cosmic substratum before the formation of the galaxy
Authors:Nowotny  E  Klapp  J
Institution:(1) Depto. de Física, Universidad Autónoma Metropolitana-Iztapalapa, México City, D.F., México;(2) Depto. de Física, Universidad Autónoma Metropolitana-Iztapalapa, México City, D.F., México;(3) Instituto Naciónal de Investigaciones Nucleares, Salazar, México
Abstract:We discuss the variable degree of ionizationx of a hydrogen-helium plasma in the early Universe for a quasi-static expansion in thermal equilibrium. The final equation for the degree of ionization can be reduced to a polynomial of fourth order inx with known coefficients depending on the temperature. Restricting to a pure hydrogen-plasma applied to the recombination era, where the main ionization effects are due to photo-electric and collisional processes, we study the dynamical evolution of the degree of ionization for nonstatic and nonequilibrium situations. The calculation can be reduced to a pure quadrature. In the linear case, we also calculate the rate of ionization.
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