  Internal (non-geometric) symmetry is recognized and studied as a new
phenomenon in cosmology. Symmetry relates cosmic vacuum to non-vacuum forms of
cosmic energies, which are dark matter, baryons, and radiation. It is argued
that the origin and physical nature of cosmic internal symmetry are due to the
interplay between gravity and electroweak scale physics in the early universe.
The time-independent characteristic number associated with this symmetry is
found in terms of the Planck energy and the electroweak energy scale. Cosmic
internal symmetry provides a framework which suggests a consistent solution to
both the `cosmic coincidence problem' and the `naturalness problem' that have
been considered as the most severe challenge to current concepts in cosmology
and fundamental physics.
