Authors Referees APS Members |
November 2007, to be published in Physical Review D15
Coupling constant constraints in a nonminimally coupled phantom cosmology
In the paper we investigate observational constraints on coupling to gravity constant parameter $\xi$ using distant supernovae SNIa data, Baryon Oscillation Peak (BOP), the CMBR shift parameter, and $H(z)$ data set. We estimate the value of this parameter to constrain the extended quintessence models with non-minimally coupled to gravity phantom scalar field. The combined analysis of observational data favors a value of $\xi$ which lies in close neighborhood of the conformal coupling. While our estimations are model dependent they give rise to a indirect bound on the Equivalence Principle. © 2008 The American Physical Society.
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