Observed Densities in the Universe

Details Observed Densities in the Universe Observed Densities in the Universe

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssrv...84...15t&link_type=abstract

Space Science Reviews, v. 84, Issue 1/2, p. 15-30 (1998).

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Baryons observed in Ly alpha absorbers contribute to the density parameter Omega0 by Omegabar >= 0.06 in close agreement with the value of 0.06 from primordial nucleosynthesis (H0=55 km s-1 Mpc-1, Lambda = 0 assumed throughout). A number of methods are known to measure Omega0 from density fluctuations; bound structures tend to yield lower values (Omegam ≈ 0.2-0.4), field galaxies over large scales higher, but still undercritical values (Omegam ≈ 0.6 +/- 0.2). The best compromise value is Omega0 ≈ 0.5, but the present methods are blind to diffusely distributed, exotic matter which still could make Omega0 = 1. A satisfactory solution of Omega0 (and Lambda) will only come from a fundamental cosmological test (e.g. the Hubble diagram of [evolution-corrected] supernovae type Ia) in combination with the CMB fluctuation spectrum.

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