A correct treatment of the stimulated process in cosmic recombination

Computer Science – Numerical Analysis

Scientific paper

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Atomic Recombination, Cosmology, Hydrogen, Interstellar Gas, Numerical Analysis, Stimulation, Absorptivity, Gas Evolution, Integral Equations, Photoionization

Scientific paper

In previous studies on cosmic recombination, the stimulated-recombination rate was calculated assuming thermal equilibrium between the excited and ionized states of neutral hydrogen atoms. After pointing out that this assumption was not correct, we present a correct method for treating their transitions. Numerical calculations show that: (1) the epoch of recombination is not greatly altered by this revision, but that (2) the residual ionization degree after a 'freeze-out' becomes smaller by a factor of 3.

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