The Cosmological Model of Brans-Dicke Theory

Details The Cosmological Model of Brans-Dicke Theory The Cosmological Model of Brans-Dicke Theory

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap%26ss.235..207l&link_type=abstract

Astrophysics and Space Science, Volume 235, Issue 2, pp.207-218

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

We use the generalized Brans-Dicke theory, in which the Pauli metric is identified to be the physical space-time metric, to study the Universe in different epochs. Exact analytical expressions for dilaton field σ, cosmological radiusR and density parameter Ω are obtained fork=+1,0,-1 Universe in the radiation-dominated epoch. For matter dominated Epoch, exact analytical expressions for Hubble parameterH, cosmological radius, dilaton field, deceleration factorq, density parameter and the gravitational coupling of the ordinary matter are obtained for the flat Universe. Other important results are: (1) the density parameter Ω is always less than unity for the flat Universe because the dilaton field plays a role as an effective dark matter, and (2) the new Brans-Dicke parameter Ω must be larger than 31.75 in order to consistent with the observed data.

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