Relative Contribution of the Hydrogen 2 s Two-Photon Decay and Lyman- α Escape Channels during the Epoch of Cosmological Recombination

Rubiño-Martin, J. A.; Sunyaev, R. A.
Bibliographical reference

Astronomy Letters, Volume 44, Issue 1, pp.1-7

Advertised on:
1
2018
Number of authors
2
IAC number of authors
1
Citations
1
Refereed citations
1
Description
We discuss the evolution of the ratio in number of recombinations due to 2 s two photon escape and due to the escape of Lyman- α photons from the resonance during the epoch of cosmological recombination, within the width of the last scattering surface and near its boundaries. We discuss how this ratio evolves in time, and how it defines the profile of the Lyman- α line in the spectrum of CMB. One of the key reasons for explaining its time dependence is the strong overpopulation of the 2 p level relative to the 2 s level at redshifts z ≲ 750.
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