Coupling constant constraints in a nonminimally coupled phantom cosmology

Abstract

In the paper we investigate observational constraints on coupling to gravity constant parameter $\xi$ using distant supernovae SNIa data, baryon oscillation peak (BOP), the cosmic microwave background radiation (CMBR) shift parameter, and $H(z)$ data set. We estimate the value of this parameter to constrain the extended quintessence models with nonminimally 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.

revtex4, 11 pages, 3 figs; (v2) 4 pages, shortened version, title changed, comments added on the Equivalence Principle; (v3) published version

References in corpus (2)

• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey

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• Non-minimal quintessence and phantom with nearly flat potentials
• Non-minimally coupled scalar field cosmology on the phase plane
• Constraints on dark energy from baryon acoustic peak and galaxy cluster gas mass measurements
• Dynamical-Screening and the Phantom-Like Effects in a DGP-Inspired $F(R,\varphi )$ Model