Quantum coherent states in cosmology

[摘要] 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 decoherenceat 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.

[发布机构] Institut UTINAM-CNRS, Université de Franche Comté, Besançon, France^1

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Coherent state;Dominant contributions;Early universe;Expansion of the universe;Infinite numbers;Initial conditions;Quantum coherent state;Quantum correction