Universe's memory and spontaneous coherence in loop quantum cosmology

TL;DR

This paper reviews how loop quantum cosmology describes the universe's transition through the quantum bounce, emphasizing the preservation of semiclassicality via spontaneous coherence in models with a positive cosmological constant.

Contribution

It extends previous studies by analyzing semiclassicality preservation in isotropic loop quantum cosmology with a positive cosmological constant and introduces the concept of spontaneous coherence ensuring semiclassical epochs.

Findings

Semiclassicality is preserved through the quantum bounce.

Spontaneous coherence guarantees semiclassical epochs in models with positive cosmological constant.

The universe can undergo an infinite chain of large epochs with maintained semiclassicality.

Abstract

The quantum bounce a priori connects several (semi)classical epochs of Universe evolution, however determining if and how well the semiclassicality is preserved in this transition is highly nontrivial. We review the present state of knowledge in that regards in the isotropic sector of loop quantum cosmology. This knowledge is next extended by studies of an isotropic universe admitting positive cosmological constant (featuring an infinite chain of large Universe epochs). It is also shown, that such universe always admits a semiclassical epoch thanks to spontaneous spontaneous coherence, provided it is semiclassical in certain constant of motion playing the role of energy.