Observational constraints on tachyonic chameleon dark energy model

TL;DR

This paper uses observational data from supernovae and baryon acoustic oscillations to constrain a tachyonic chameleon dark energy model, demonstrating its compatibility with current cosmological observations.

Contribution

It provides the first observational constraints on the parameters of the tachyonic chameleon dark energy model with various coupling and potential forms.

Findings

Model is compatible with observational data

Constraints on model parameters are derived

Exponential and non-exponential forms both fit observations

Abstract

It has been recently shown that tachyonic chameleon model of dark energy in which tachyon scalar field non-minimally coupled to the matter admits stable scaling attractor solution that could give rise to the late-time accelerated expansion of the universe and hence alleviate the coincidence problem. In the present work, we use data from Type Ia supernova (SN Ia) and Baryon Acoustic Oscillations to place constraints on the model parameters. In our analysis we consider in general exponential and non-exponential forms for the non-minimal coupling function and tachyonic potential and show that the scenario is compatible with observations.