Dark Energy: fiction or reality?

Is Dark Energy justified as an alternative to the cosmological constant $Λ$ in order to explain the acceleration of the cosmic expansion ? It turns out that a straightforward dimensional analysis of Einstein equation provides us with clear evidences that the geometrical nature of $Λ$ is the only viable source to this phenomenon, in addition of the application of Ockham's razor principle. This contribution is primarily a review of the main stream in the interpretation of $Λ$ because it is at the origin of such a research program.

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