In other words, the scale associated with dark energy
(DE ∼ 0.1 mm or mDE ∼ 10−3 eV) is the geometric
mean of the infrared cut-off (Λ is the size of the observable
Universe) and of the ultraviolet cut-off (the Planck
scale). It remains to be seen whether this is a mere coincidence
or an indication of a deeper reality.