QCD ghost dark energy cannot (even roughly) explain the main features of the accepted cosmological paradigm

Understand

We explore the whole phase space of the so called Veneziano/QCD ghost dark energy models where the dynamics of the inner trapping horizon is ignored and also the more realistic models where the time-dependence of the horizon is taken into consideration.

• We pay special attention to the choice of phase space variables leading to bounded and compact phase space so that no critical point of physical interest is missing.
• It is demonstrated that ghost dark energy is not a suitable candidate to explain the presently accepted cosmological paradigm since no critical point associated with matter dominance is found in the physical phase space of the model.
• A transient stage of matter dominance -- responsible for the observed amount of cosmic structure -- is an essential ingredient of the accepted cosmological paradigm.