Ruling out a critical density baryonic universe
arXiv:hep-ph/9705331 · doi:10.1016/S0370-2693(97)00833-2
Abstract
It has been suggested by Bartlett and Hall that our universe may have the critical density in baryons by virtue of specific interactions with a `shadow' world. We show that this possibility is severely constrained by primordial nucleosynthesis, stellar evolution and the thermalization of the cosmic microwave background. In particular, recent observations of small angular-scale anisotropy in the cosmic microwave background conclusively rule out all such baryon-dominated cosmologies.
17 pages incl. 8 eps figures, REVTEX
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