Kinetic coupled tachyon: A dynamical system analysis
Abstract
We present and examine a kinetically coupled tachyon dark energy model, where a tachyon scalar field interacts with the matter sector. More specifically, we deduce this cosmological setting from a generalised interacting dark energy model that allows for the kinetic term of the scalar field to couple to the matter species a priori in the action. A thorough dynamical system analysis and its cosmological implications unveil the appearance of a scaling solution which is also an attractor of the system, thanks to a novel critical point, with a period of accelerated expansion thereafter. This new solution, not present in the uncoupled case, has the enticing consequence of alleviating the coincidence problem.
Keywords
Cite
@article{arxiv.2412.20118,
title = {Kinetic coupled tachyon: A dynamical system analysis},
author = {Francesco Pace and Alberto Rozas-Fernández and Özgen Tunç Türker},
journal= {arXiv preprint arXiv:2412.20118},
year = {2024}
}
Comments
32 pages, 4 figures. Accepted for publication in Physics of the Dark Universe