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Astron. Astrophys. 329, L17-L19 (1998)

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1. Introduction

The dynamical parameters describing the cosmic expansion are still very inaccurately known, permitting a wide range of cosmological models to appear plausible. Judging from all the information available at present, the Universe is either open, with the total density parameter [FORMULA] or flat by virtual of the presence of a cosmological constant. Let us use the notation

[EQUATION]

where the density parameter of the vacuum energy is [FORMULA], and [FORMULA] is the density parameter of baryonic + dark matter.

We study here whether the "standard model" of flat space with [FORMULA] is still viable in the light of recent determinations of several cosmological parameters.

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© European Southern Observatory (ESO) 1998

Online publication: November 24, 1997
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