Global Constraints On Key Cosmological Parameters

Details Global Constraints On Key Cosmological Parameters Global Constraints On Key Cosmological Parameters

2000-12-06

arxiv.org/abs/astro-ph/0012149v1

Astronomy and Astrophysics

Astrophysics

19 pages, 6 figures

Scientific paper

Data from Type Ia supernovae, along with X-ray cluster estimates of the universal baryon fraction and Big Bang Nucleosynthesis (BBN) determinations of the baryon-to-photon ratio, are used to provide estimates of several global cosmological parameters at epochs near zero redshift. We show that our estimate of the present baryon density is in remarkably good agreement with that inferred from BBN at high redshift, provided the primordial abundance of deuterium is relatively low and the Universe is flat. We also compare these estimates to the baryon density at z = 1100 as inferred from the CMB angular power spectrum.

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