Observational constraints in scalar tensor theory with tachyonic potential

TL;DR

This paper investigates scalar tensor cosmology with a tachyon field, fitting model parameters to observational data to understand universe dynamics, equation of state, and scalar field behavior.

Contribution

It introduces an approach to fit scalar tensor models with tachyon fields to observational data, providing an observationally verified understanding of the universe's evolution.

Findings

Best-fit model parameters align with observational data.

Reconstructed scalar field matches theoretical expectations.

Equation of state parameter indicates accelerated expansion.

Abstract

We study the dynamics of the scalar tensor cosmological model in the presence of tachyon field. In an alternative approach, in two exponential and power law form of the scalar field functions in the model, field equations are solved by simultaneously best fitting the model parameters with the most recent observational data. This approach gives us an observationally verified interpretation of the dynamics of the universe. We then discuss the best fitted of equation of state parameter, the statefinder parameters and the reconstructed scalar field in the model.