Quantum coherent states in cosmology
  Coherent states consist of superposition of infinite number of particles and
do not have a classical analogue. We study their evolution in a FLRW cosmology
and show that only when full quantum corrections are considered, they may
survive the expansion of the Universe and form a global condensate. This state
of matter can be the origin of accelerating expansion of the Universe,
generally called dark energy, and inflation in the early universe.
Additionally, such a quantum pool may be the ultimate environment for
decoherence at shorter distances. If dark energy is a quantum coherent state,
its dominant contribution to the total energy of the Universe at present
provides a low entropy state which may be necessary as an initial condition for
a new Big Bang in the framework of bouncing cosmology models.
