We use cosmic microwave background data from WMAP, ACBAR, VSA and CBI, and galaxy power spectrum data from 2dF, to constrain flat cosmologies based on the Jordan-Brans-Dicke theory, using a Markov chain Monte Carlo approach. Using a parametrization based on ξ=1/4ω, and performing an exploration in the range lnξ∈[-9,3], we obtain a 95% marginalized probability bound of lnξ<-6.2, corresponding to a 95% marginalized probability lower bound on the Brans-Dicke parameter ω>120.
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Acquaviva et al. (2005) studied this question.
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