Observational constraints on non-minimally coupled Galileon model

preprint2014arXivOpen access

Abstract

As an extension of Dvali-Gabadadze-Porrati (DGP) model, the Galileon theory has been proposed to explain the "self-accelerating problem" and "ghost instability problem". In this Paper, we extend the Galileon theory by considering a non-minimally coupled Galileon scalar with gravity. The statefinder analysis, Om(z)Om(z) diagnostic and constraint the model parameters have been investigate , we find Ωm0=0.263−0.031+0.031Ω_\text{m0}=0.263_{-0.031}^{+0.031}, n=1.53−0.37+0.21n=1.53_{-0.37}^{+0.21} (at the 95%95\% confidence level) with χmin2=473.376χ^2_{\text{min}}=473.376. Further we show that due to the SNe Ia + BAO data ,our model behaves like a phantom-like dark energy.

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