Coherent states in the quantum multiverse

TL;DR

This paper explores the role of coherent and squeezed quantum states in the multiverse, especially focusing on accelerated universes, revealing their non-classical nature in quantum cosmology.

Contribution

It introduces the concept of squeezed states as the quantum description of multiverses with accelerated universes, highlighting their non-classical properties.

Findings

Quantum states of accelerated universes are squeezed states.

Squeezed states have no classical analogs.

Provides a quantum description of multiverses in cosmology.

Abstract

In this paper, we study the role of coherent states in the realm of quantum cosmology, both in a second-quantized single universe and in a third-quantized quantum multiverse. In particular, most emphasis will be paid to the quantum description of multiverses made up of accelerated universes. We have shown that the quantum states involved at a quantum mechanical multiverse whose single universes are accelerated are given by squeezed states having no classical analogs.