Quantum coherent states in cosmology

Abstract

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.

Comments: 8 pages, 4 figures. Proceedings of $7^{th}$ International Workshop DICE2014, Spacetime - Matter - Quantum Mechanics, Sep. 15-19, 2014, Castigilioncello, Tuscany, Italy