Did the universe recombine?

Details Did the universe recombine? Did the universe recombine?

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371....8b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 8-13. Research supported by NSF, Canadian Institute

Astronomy and Astrophysics

Astrophysics

46

Cosmology, Nuclear Astrophysics, Relic Radiation, Universe, Astronomical Models, Baryons, Cosmic Background Explorer Satellite

Scientific paper

The Zel'dovich-Sunyaev model-independent arguments for the existence of a neutral hydrogen phase is reviewed in light of new limits on the Compton y parameter from COBE. It is concluded that with baryon densities compatible with standard cosmological nucleosynthesis, the universe could have remained fully ionized throughout its history without producing a detectable spectral distortion. It is argued that it is unlikely that spectral observations of the cosmic microwave background will ever require the universe to have recombined for flat cosmologies.

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