Quantum Thermodynamics and Quantum Entanglement Entropies in an Expanding Universe

TL;DR

This paper explores the relationship between quantum entanglement and thermodynamics in an expanding universe, showing that entanglement entropy can inform about spacetime parameters and unify quantum information with cosmological thermodynamics.

Contribution

It demonstrates that entanglement entropy and particle creation entropy behave similarly in an expanding universe, linking quantum information measures with cosmological thermodynamics.

Findings

Entanglement and particle creation entropies show similar behavior.

Entanglement entropy can be used to infer spacetime parameters.

Quantum thermodynamics and quantum entanglement are interconnected in cosmological settings.

Abstract

We investigate an asymptotically spatially flat Robertson-Walker spacetime from two different perspectives. First, using von Neumann entropy, we evaluate the entanglement generation due to the encoded information in spacetime. Then, we work out the entropy of particle creation based on the quantum thermodynamics of the scalar field on the underlying spacetime. We show that the general behavior of both entropies are the same. Therefore, the entanglement can be applied to the customary quantum thermodynamics of the universe. Also, using these entropies, we can recover some information about the parameters of spacetime.