Vol 17, No 3

Cosmological parameters for spatially flat dust filled Universe in Brans-Dicke theory

Gopi Kant Goswami


Abstract We have investigated late time acceleration for a spatially flat dust filled Universe in Brans-Dicke theory in the presence of a positive cosmological constant Λ. Expressions for Hubble’s constant, luminosity distance and apparent magnitude have been obtained for our model. The theoretical results are compared with observed values of the latest 287 high redshift (0.3 ≤ z ≤ 1.4) Type Ia supernova data taken from the Union 2.1 compilation to estimate present values of matter and dark energy parameters, (Ωm)0 and (ΩΛ)0. We have also estimated the present value of Hubble’s constant H0 in light of an updated sample of Hubble parameter measurements including 19 independent data points. The results are found to be in good agreement with recent astrophysical observations. We also calculated various physical parameters such as matter and dark energy densities, present age of the Universe and deceleration parameter. The value for Brans-Dicke-coupling constant ω is set to be 40 000 based on accuracy of solar system tests and recent experimental evidence.


Keywords cosmology: cosmological parameters — cosmology: observations — dark energy — Brans-Dicke theory

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