Late-time acceleration in the coupled Cubic Galileon models

TL;DR

This paper explores coupled cubic Galileon models with potentials to explain late-time cosmic acceleration, analyzing their equations of state and finding no future transition to a phantom phase.

Contribution

It introduces a framework for analyzing coupled cubic Galileon models with potentials, including native and effective equations of state, to assess cosmic acceleration.

Findings

No transition from acceleration to phantom phase in the future

Models can explain late-time acceleration without future phantom crossing

Coupling affects the equations of state analysis

Abstract

We investigate the linearly and quadratically coupled cubic Galileon models that include linear potentials. These models may explain the late-time acceleration. In these cases, we need two equations of state parameter named the native and effective equations of state to test whether the universe is accelerating or not because there is coupling between the cold dark matter and Galileon. It turns out that there is no transition from accelerating phase to phantom phase in the future.