Dynamics of Scalar Field Dark Matter With a Cosh-like Potential

TL;DR

This paper investigates the evolution of scalar field dark matter with a cosh-like potential, showing it leads to a late-time de Sitter universe and mediates between early radiation dominance and late acceleration.

Contribution

It provides a detailed analysis of scalar field dark matter dynamics with a cosh-like potential, highlighting the conditions for late-time acceleration and the mediating role of oscillating solutions.

Findings

Late-time attractor is always de Sitter.

Oscillating scalar field mediates between radiation and acceleration.

Parameters determine the transition dynamics.

Abstract

The dynamics of a cosmological model fueled by scalar field dark matter with a cosh-like potential plus a cosmological constant is investigated in detail. It is revealed that the late-time attractor is always the de Sitter solution, and that, depending on the values of the free parameters, the oscillating solution of the scalar field -- modeling cold dark matter -- mediates between some early stage (say, the radiation-dominated solution) and the accelerating de Sitter attractor.