# Non-minimally coupled scalar field cosmology with torsion

## TL;DR

This paper explores a generalized scalar-torsion cosmological model with a non-minimally coupled Gauss-Bonnet term, showing that torsion can drive cosmic acceleration and analyzing its dynamical behavior.

## Contribution

It introduces a new scalar-torsion cosmological framework with non-minimal Gauss-Bonnet coupling, analyzing its implications for universe acceleration and stability.

## Key findings

- Torsion is essential when non-minimal couplings are present.
- The torsional fluid can cause the universe's current acceleration.
- Accelerated expansion is a generic feature of the model.

## Abstract

In this work we present a generalized Brans-Dicke lagrangian including a non-minimally coupled Gauss-Bonnet term without imposing the vanishing torsion condition. In the resulting field equations, the torsion is closely related to the dynamics of the scalar field, i.e., if non-minimally coupled terms are present in the theory, then the torsion must be present. For the studied lagrangian we analyze the cosmological consequences of an effective torsional fluid and we show that this fluid can be responsible for the current acceleration of the universe. Finally, we perform a detailed dynamical system analysis to describe the qualitative features of the model, we find that accelerated stages are a generic feature of this scenario.