Abstract
It is assumed that during the recombination era the Universe is a fluid consisting of plasma, neutral hydrogen, and radiation interacting via the processes of photo-recombination, photo-ionization, and Thomson scattering. The corresponding mass exchanges between plasma and hydrogen and both the momentum and energy transfer are calculated near the hydrodynamical equilibrium. A perturbation in the hydrodynamical quantities is introduced and the corresponding dynamical equations are obtained as well.
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Corona-Galindo, M.G., Ebner, D. & Dehnen, H. Momentum and energy transfer between plasma, hydrogen, and radiation during the recombination era of the Universe. Astrophys Space Sci 153, 109–119 (1989). https://doi.org/10.1007/BF00643616
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DOI: https://doi.org/10.1007/BF00643616