Kinetic k-essence ghost dark energy model

TL;DR

This paper explores how a kinetic k-essence scalar field can model ghost dark energy, which explains the universe's accelerated expansion, by reconstructing the scalar field function based on the energy density evolution.

Contribution

It establishes a connection between ghost dark energy and kinetic k-essence fields, providing a new way to describe dark energy dynamics in cosmology.

Findings

The evolution of ghost dark energy can be fully described by a kinetic k-essence scalar field.

Reconstruction of the kinetic k-essence function F(X) aligns with ghost dark energy behavior.

The model offers a unified scalar field description of dark energy in a flat FRW universe.

Abstract

A ghost dark energy model has been recently put forward to explain the current accelerated expansion of the Universe. In this model, the energy density of ghost dark energy, which comes from the Veneziano ghost of QCD, is proportional to the Hubble parameter, $\rho_D=\alpha H$. Here $\alpha$ is a constant of order $\Lambda^3_{QCD}$ where $\Lambda_{QCD}\sim 100 MeV$ is the QCD mass scale. We consider a connection between ghost dark energy with/without interaction between the components of the dark sector and the kinetic k-essence field. It is shown that the cosmological evolution of the ghost dark energy dominated Universe can be completely described a kinetic k-essence scalar field. We reconstruct the kinetic k-essence function $F(X)$ in a flat Friedmann-Robertson-Walker Universe according to the evolution of ghost dark energy density.