New CMB constraints on the cosmic matter budget: trouble for nucleosynthesis?

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  • 28 April 2000
Abstract
We compute the joint constraints on ten cosmological parameters from the latest CMB measurements. The lack of a significant second acoustic peak in the latest Boomerang data favors models with more baryons than Big Bang nucleosynthesis predicts, almost independently of what prior information is included. The simplest inflation models with purely scalar scale-invariant fluctuations in a flat Universe prefer a baryon density 0.024 < h^2 Omega_b < 0.042 and a total (hot + cold) dark matter density 0.16 < h^2 Omega_b < 0.51 at 95% confidence.

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