Abstract

Measurements of the density parameter of the universe Ω have slowly converged towards the critical value of 1, where the universe is defined to be flat and Euclidean. New data provided by the Planck probe suggest there may be a critical value for the dark energy component of this parameter ΩΛ. A physical significance may occur at ΩΛ = 2/3 and be connected with the origin of inertia. If future observations constrain ΩΛ to exactly this value, the implication is that dark energy originates in constraints provided by fundamental laws of physics on possible cosmologies for the universe.

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