The de Broglie-Bohm Quantum Theory and its Application to Quantum Cosmology

TL;DR

This paper reviews the de Broglie-Bohm quantum theory, highlighting its deterministic trajectories and applicability to cosmology, where it offers models free of singularities and potential alternatives to inflation.

Contribution

It presents the de Broglie-Bohm theory as a viable framework for quantum cosmology, emphasizing its non-probabilistic nature and its ability to produce singularity-free models.

Findings

Cosmological models without singularities are possible.

The theory can be used to construct cosmological perturbations.

It offers an alternative to inflationary models.

Abstract

We review the de Broglie-Bohm quantum theory. It is an alternative description of quantum phenomena in accordance with all the quantum experiments already performed. Essentially, it is a dynamical theory about objectively real trajectories in the configuration space of the physical system under investigation. Hence, it is not necessarily probabilistic, and it dispenses with the collapse postulate, making it suitable to be applied to cosmology. The emerging cosmological models are usually free of singularities, with a bounce connecting a contracting era with an expanding phase, which we are now observing. A theory of cosmological perturbations can also be constructed under this framework, which can be successfully confronted with current observations, and can complement inflation or even be an alternative to it.