  A finite vacuum energy density implies the existence of a UV scale for
gravitational modes. This gives a phenomenological scale to the dynamical
equations governing the cosmological expansion that must satisfy constraints
consistent with quantum measurability and spatial flatness. Examination of
these constraints for the observed dark energy density establishes a time
interval from the transition to the present, suggesting major modifications
from the thermal equations of state far from Planck density scales. The
assumption that a phase transition initiates the radiation dominated epoch is
shown under several scenarios to produce fluctuations to the CMB of the order
observed. Quantum measurability constraints (eg. uncertainly relations) define
cosmological scales bounded by luminal expansion rates. It is shown that the
dark energy can consistently be interpreted as being due to the vacuum energy
of collective gravitational modes which manifest as the zero-point motions of
coherent Planck scale mass units prior to the UV scale onset of gravitational
quantum de-coherence for the cosmology.
