Asymptotic cosmological regimes in scalar-torsion gravity with a perfect fluid

TL;DR

This paper analyzes the long-term behavior of scalar-torsion gravity models with hydrodynamical matter, identifying stable cosmological regimes such as de Sitter and tracker solutions, depending on model parameters.

Contribution

It introduces a detailed stability analysis of various asymptotic cosmological regimes in scalar-torsion gravity with power-law scalar potentials.

Findings

Multiple stable asymptotic regimes identified

Conditions for stability depend on coupling and potential parameters

De Sitter and tracker solutions are among the stable regimes

Abstract

We consider cosmological dynamics of nonminimally coupled scalar field in the scalar-torsion gravity in the presence of a hydrodynamical matter. Potential of the scalar field have been chosen as power-law with negative index, this type of potentials is usually used in quintessence scenarios. We identify several asymptotic regimes, including de Sitter, kinetic dominance, kinetic tracker and tracker solution and study conditions for their existence and stability. We show that for each combination of coupling constant and potential power index one of regimes studied in the present paper is stable to the future.