Tachyonic fields in cosmology

TL;DR

This paper explores how tachyonic scalar fields could explain the Universe's accelerated expansion, analyzing their potential and kinetic behaviors, and distinguishing them from other dark energy models.

Contribution

It introduces a method to differentiate tachyonic scalar fields from classical scalar fields as dark energy candidates based on their properties.

Findings

Derived potential and kinetic term dependencies on scale factor for tachyonic fields.

Analyzed distinctions between tachyonic and classical scalar fields.

Discussed observational implications for dark energy models.

Abstract

The possibility of explanation of accelerated expansion of the Universe by tachyonic scalar fields which homogeneously fill the world is discussed. The dependences of potential and kinetic term on scale factor are deduced for the case of quintessential and phantom dark energy with generalized linear barotropic equation of state. The possibility to distinguish the tachyonic scalar field as dark energy from other scalar field models, especially from classical scalar field, is analyzed.