Kinetic k-essence ghost dark energy model

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 ${\Lambda }_{QCD}^3$ where ${\Lambda }_{QCD}\sim 100MeV$ 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.

11 pages, 15 figures, some clarifications added in the introduction, added references. Accepted for publication in Phys. Lett. B

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