  Examining the reverse evolution of the universe from the present, long before
reaching Planck density dynamics one expects major modifications from the
de-coherent thermal equations of state, suggesting a prior phase that has
macroscopic coherence properties. The assumption that the phase transition
occurs during the radiation dominated epoch, and that zero-point motions drive
the fluctuations associated with this transition, specifies a class of
cosmological models in which the cosmic microwave background fluctuation
amplitude at last scattering is approximately $10^{-5}$. Quantum measurability
constraints (eg. uncertainly relations) define cosmological scales whose
expansion rates can be at most luminal. Examination of these constraints for
the observed dark energy density establishes a time interval from the
transition to the present. It is shown that the dark energy can consistently be
interpreted as 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 gravitational quantum de-coherence of the cosmology. A scenario is
suggested that connects microscopic physics to the relevant cosmological scale.
