Dynamical analysis for a vector-like dark energy

TL;DR

This paper investigates the dynamical behavior of a vector-like dark energy model within a cosmological setting, considering interactions with matter and analyzing its asymptotic states using dynamical systems theory.

Contribution

It introduces a dynamical analysis of vector-like dark energy with interactions, expanding understanding of its potential role in cosmic evolution.

Findings

Both matter and dark energy dominated eras are described by stable critical points.

The dynamical system approach effectively characterizes asymptotic cosmological states.

Interaction between dark energy and matter influences the stability of critical points.

Abstract

In this paper we perform a dynamical analysis for a vector field as a candidate for the dark energy, in the presence of a barothropic fluid. The vector is one component of the so-called cosmic triad, which is a set of three identical copies of an abelian field pointing mutually in orthogonal directions. In order to generalize the analysis, we also assumed the interaction between dark energy and the barotropic fluid, with a phenomenological coupling. Both matter and dark energy eras can be successfully described by the critical points, indicating that the dynamical system theory is a viable tool to analyze asymptotic states of such cosmological models.