Stability analysis and observational constraints in scalar tensor theory

TL;DR

This paper investigates the stability and observational constraints of a scalar tensor cosmological model, revealing its ability to predict current acceleration and future phantom crossing of the universe.

Contribution

It introduces a combined dynamical system and data fitting approach to analyze stability and constrain parameters in scalar tensor cosmology.

Findings

Model predicts current accelerating universe

Universe may experience phantom crossing in near future

Constraints on model parameters from observational data

Abstract

We study FRW cosmology for scalar tensor theory where two scalar functions nonminimally coupled to the geometry and matter Lagrangian. In a framework to study stability and attractor solutions of the model in the phase space, we simultaneously solve the dynamical system and best fit the stability and model parameters with the observational data. The approach imposes restrictions on the model constraints while providing information about the universe dynamics. The model predict current accelerating universe, with a phantom crossing in near future.