Why we observe an almost classical spacetime

TL;DR

This paper proposes that quantum conformal metric fluctuations serve as the environment causing decoherence in spacetime, which is crucial for understanding selfmeasurement in quantum gravity.

Contribution

It introduces quantum conformal metric fluctuations as a key factor in spacetime decoherence, advancing the understanding of quantum gravity's measurement problem.

Findings

Quantum conformal fluctuations induce decoherence in spacetime

Decoherence explains the emergence of classical spacetime

Supports the view of spacetime as almost classical due to quantum effects

Abstract

We argue that, in order to obtain decoherence of spacetime, we should consider quantum conformal metric fluctuations of spacetime. This could be the required environment in the problem of selfmeasurement of spacetime in quantum gravity.