Observational constraints on non-minimally coupled Galileon model

TL;DR

This paper investigates a non-minimally coupled Galileon model using observational data, constraining its parameters and analyzing its dark energy behavior, showing it mimics phantom-like dark energy.

Contribution

It extends the Galileon theory by incorporating non-minimal coupling and provides observational constraints on its parameters.

Findings

Estimated matter density parameter: $oxed{0.263}$

Best-fit model parameter: $n=1.53$

Model exhibits phantom-like dark energy behavior

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, $Om(z)$ diagnostic and constraint the model parameters have been investigate , we find $\Omega_\text{m0}=0.263_{-0.031}^{+0.031}$, $n=1.53_{-0.37}^{+0.21}$ (at the $95\%$ confidence level) with $\chi^2_{\text{min}}=473.376$. Further we show that due to the SNe Ia + BAO data ,our model behaves like a phantom-like dark energy.