  The holographic dark energy model is obtained from a cosmological constant
generated by generic quantum gravity effects giving a minimum length. By
contrast, the usual bound for the energy density to be limited by the formation
of a black hole simply gives the Friedmann equation. The scale of the current
cosmological constant relative to the inflationary scale is an arbitrary
parameter characterizing initial conditions, which however can be fixed by
introducing a physical principle during inflation, as a function of the number
of e-folds and the inflationary scale.
