Light mass galileon and late time acceleration of the Universe

TL;DR

This paper investigates a light mass Galileon scalar field model with a potential, using statefinder and $Om$ diagnostics to distinguish it from $ ext{ extLambda}$CDM and constraining parameters with observational data.

Contribution

It introduces a Galileon model with a specific lowest order term and applies diagnostic tools to differentiate models and fit observational data.

Findings

Statefinder hierarchy effectively distinguishes Galileon models.

$Om$ diagnostic constrains model parameters with SN, Hubble, BAO data.

Model shows compatibility with late-time cosmic acceleration.

Abstract

We study Galileon scalar field model by considering the lowest order Galileon term in the lagrangian, $(\partial_{\mu} \phi)^2 \Box\phi$ by invoking a field potential. We use Statefinder hierarchy to distinguish the light mass galileon models with different potentials amongst themselves and from the $\Lambda$CDM behaviour. The $Om$ diagnostic is applied to cosmological dynamics and observational constraints on the model parameters are studied using SN+Hubble+BAO data.