Generalized ghost dark energy in Brans-Dicke theory

Understand

It was argued that the vacuum energy of the Veneziano ghost field of QCD, in a time-dependent background, can be written in the general form, $H + O(H^2)$, where $H$ is the Hubble parameter.

• Based on this, a phenomenological dark energy model whose energy density is of the form $\rho=\alpha H+\beta H^{2}$ was recently proposed to explain the dark energy dominated universe.
• In this paper, we investigate this generalized ghost dark energy model in the setup of Brans-Dicke cosmology.
• We study the cosmological implications of this model.