Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ianp.symp...23t&link_type=abstract
Symposium on the Interface of Astrophysics with Nuclear and Particle Physics, p. 23 - 49
Astronomy and Astrophysics
Astrophysics
Scientific paper
Attempts to derive the mean mass density of the universe from the deceleration parameter q0 remain inconclusive. Density determinations from the mass associated with luminous matter (Ω0 = 0.1 - 0.12), from the Virgocentric streaming motion (Ω0 = 0.08), and from the motion with respect to the CMB (Ω0 = 0.14 - 0.22) agree surprisingly well. These values do not violate the upper bound for the baryon density of ΩB < 0.2 - 0.3 from (inhomogeneous) primordial nucleosynthesis. Time scale arguments could allow for a higher value of Ω0. The mass needed for a flat universe (Ω0 = 1) must be, if it exists, dark, non-baryonic and have a large clustering scale length. There is, however, only a marginal increase Ω0 with the scale length, over which it can be measured.
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