Distinguishing Jordan and Einstein frames in gravity through entanglement

TL;DR

This paper explores how quantum entanglement can distinguish between Jordan and Einstein frames in gravity, revealing subtle differences caused by an extra scalar degree of freedom at the quantum level.

Contribution

It demonstrates that entanglement measurements can detect differences between the Jordan and Einstein frames due to the scalar degree of freedom.

Findings

Entanglement can probe differences between frames.

Quantum effects reveal subtle distinctions at the scalar level.

The extra scalar degree of freedom influences entanglement properties.

Abstract

In general relativity, the use of conformal transformation is ubiquitous and leads to two different frames of reference, known as the Jordan and the Einstein frames. Typically, the transformation from the Jordan frame to the Einstein frame involves introducing an additional scalar degree of freedom, often already present in the theory. We will show that at the quantum level, owing to this extra scalar degree of freedom these two frames exhibit subtle differences that the entanglement between two massive objects can probe.