Emergent de Sitter epoch of the quantum Cosmos

TL;DR

This paper explores how loop quantum cosmology predicts a quantum bounce followed by a large de Sitter-like expansion with an emergent cosmological constant of Planckian scale, altering traditional bounce models.

Contribution

It introduces a modified Hamiltonian regularization that results in an emergent de Sitter epoch after the quantum bounce in loop quantum cosmology.

Findings

Quantum bounce connects large classical universes.

Emergent de Sitter epoch with Planckian cosmological constant.

Smooth transition to flat expanding universe.

Abstract

The quantum nature of the Big Bang is reexamined in the framework of Loop Quantum Cosmology. The strict application of a regularization procedure to the Hamiltonian, originally developed for the Hamiltonian in loop quantum gravity, leads to a qualitative modification of the bounce paradigm. Quantum gravity effects still lead to a quantum bounce connecting deterministically large classical Universes. However, the evolution features a large epoch of de Sitter Universe, with emergent cosmological constant of Planckian order, smoothly transiting into a flat expanding Universe.