Interacting Tachyonic Scalar Field III

TL;DR

This paper investigates a linearly interacting tachyonic scalar field as a candidate for dark energy, analyzing its effects on cosmological parameters and the universe's accelerated expansion.

Contribution

It introduces a linear parameterization of interaction between tachyonic fields, matter, and Hubble's parameter, providing new insights into dark energy modeling.

Findings

Maximum coupling strength of unity when interaction depends solely on energy densities

Upper limit of 0.7 for coupling strength when combining interactions

Analysis of cosmological parameters in a flat universe

Abstract

This study explores the plausibility of an interacting tachyonic scalar, homogeneous in nature, as a promising candidate for dynamic dark energy, offering insights into the observed accelerated expansion of the universe. The parameterization of the interaction between the tachyonic field, matter, and Hubble's parameter is performed linearly. The analysis focuses on fundamental cosmological parameters in a flat universe $(K = 0)$: expansion rate, universe age, energy density evolution for matter and the tachyonic field. The study also examines the coupling strength between the tachyonic field and matter, revealing a maximum value of unity when the interaction depends solely on their energy densities. Combining them also yields an upper limit of unity (precisely 0.7) for the coupling strength.