Timelike information broadcasting in cosmology

TL;DR

This paper investigates how quantum fields in cosmological settings transmit information and correlations, analyzing effects like the violation of the strong Huygens principle and correlation harvesting, including in Loop Quantum Cosmology models.

Contribution

It introduces a quantum information framework to study information transmission in cosmology, including non-standard models like the Big Bounce in Loop Quantum Cosmology.

Findings

Quantum correlations are affected by violations of the strong Huygens principle.

Correlation harvesting enables information transfer across cosmological epochs.

Results extend to non-general relativistic cosmological models.

Abstract

We study the transmission of information and correlations through quantum fields in cosmological backgrounds. With this aim, we make use of quantum information tools to quantify the classical and quantum correlations induced by a quantum massless scalar field in two particle detectors, one located in the early universe (Alice's) and the other located at a later time (Bob's). In particular, we focus on two phenomena: a) the consequences on the transmission of information of the violations of the strong Huygens principle for quantum fields, and b) the analysis of the field vacuum correlations via correlation harvesting from Alice to Bob. We will study a standard cosmological model first and then assess whether these results also hold if we use other than the general relativistic dynamics. As a particular example, we will study the transmission of information through the Big Bounce, that replaces the Big Bang, in the effective dynamics of Loop Quantum Cosmology.