Recombination Dynamics of Primordial Hydrogen and Helium (He I) in the Universe

Details Recombination Dynamics of Primordial Hydrogen and Helium (He I) in the Universe Recombination Dynamics of Primordial Hydrogen and Helium (He I) in the Universe

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..359d&link_type=abstract

Astronomy Letters, vol. 31, Issue 6, p.359-364

Astronomy and Astrophysics

Astronomy

62

Cosmology - Early Universe - Primordial Helium - Recombination - Radio Astronomy - Cosmic Microwave Background Radiation

Scientific paper

We calculated the ionization fraction for hydrogen and helium (He I) as a function of the redshift z by including the two-photon decays of high hydrogen and parahelium levels and the radiative transfer in the helium 23P1 ↔ 11 S 0 intercombination line. We show that this yields corrections of no more than a few percent to the ionization fraction for hydrogen and speeds up significantly the recombination for helium compared to the recent works by Seager et al. (1999, 2000), in which these effects were disregarded.

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