Quantum-to-classical transition of primordial cosmological perturbations in de Broglie-Bohm quantum theory: the bouncing scenario

TL;DR

This paper explores how primordial cosmological perturbations transition from quantum to classical in a bouncing universe scenario using de Broglie-Bohm quantum theory, extending previous inflationary results to quantum bounce models.

Contribution

It demonstrates the quantum-to-classical transition of primordial perturbations in a bouncing universe within the de Broglie-Bohm framework, including quantum effects of background geometry.

Findings

Quantum-to-classical transition occurs around the bounce.

De Broglie-Bohm theory effectively describes perturbation evolution.

Transition is consistent with structure formation requirements.

Abstract

In a previous work we have exhibited a clear description of the quantum-to-classical transition of cosmological quantum fluctuations in the inflationary scenario using the de Broglie-Bohm quantum theory. These fluctuations are believed to seed the small inhomogeneities, which are then responsible for the formation of large scale structures. In this work we show that using the de Broglie-Bohm theory it is also possible to describe the quantum-to-classical transition of primordial perturbations which takes place around a bouncing phase, even if the latter is caused by quantum effects due to the quantization of the background geometry.