Did the universe recombine? New spectral constraints on reheating

Details Did the universe recombine? New spectral constraints on reheating Did the universe recombine? New spectral constraints on reheating

1993-07-09

arxiv.org/abs/astro-ph/9307018v2

Astrophys.J.423:529-533,1994

Astronomy and Astrophysics

Astrophysics

15 pages, incl 3 figures. Stone-age postscript replaced by LATeX. Latest version at http://www.sns.ias.edu/~max/y.html (faster

Scientific paper

10.1086/173831

One still cannot conclusively assert that the universe underwent a neutral phase, despite the new COBE FIRAS limit y<0.000025 on Compton y-distortions of the cosmic microwave background. Although scenarios where the very early (z=1000) ionization is thermal, caused by IGM temperatures exceeding 10000K, are clearly ruled out, there is a significant loophole for cosmologies with typical CDM parameters if the dominant ionization mechanism is photoionization. If the ionizing radiation has a typical quasar spectrum, then the y-constraint implies roughly h^{3/2}\Omega_b Omega_0^{-1/4}<0.1 for fully ionized models. This means that BDM models with Omega_0 around 0.15 and reionization at about z=1000 are strongly constrained even in this very conservative case, and can survive the y test only if most of the baryons form BDM around the reionization epoch.

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