Entanglement in a multiverse with no common space-time

TL;DR

This paper explores the possibility that entanglement between universes in a multiverse without shared space-time could influence observable properties of our universe, offering a potential way to test multiverse theories.

Contribution

It proposes that inter-universal entanglement can have observable effects within a single universe, even without shared space-time, providing a novel approach to multiverse testability.

Findings

Entanglement affects the dynamical properties of our universe.

Thermodynamical consequences of inter-universal entanglement are identified.

Potential observational signatures of multiverse entanglement are discussed.

Abstract

Inter-universal entanglement may even exist in a multiverse in which there is no common space-time among the universes. In particular, the entanglement between the expanding and contracting branches of the universe might have observable consequences in the dynamical and thermodynamical properties of one single branch, making therefore testable the whole multiverse proposal, at least in principle.