How exactly did the Universe become neutral?
Astrophysical Journal Supplement Series, no. 2 (1999): 407-430
We present a refined treatment of H, He I, and He II recombination in the early Universe. The difference from previous calculations is that we use multi-level atoms and evolve the population of each level with redshift by including all bound-bound and bound-free transitions. In this framework we follow several hundred atomic energy levels...更多
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