Fundamental decoherence in quantum gravity

TL;DR

This paper discusses a discrete formalism in quantum gravity that addresses the problem of time, leading to a fundamental decoherence mechanism in quantum states which impacts black hole information paradoxes.

Contribution

It introduces a relational formalism in quantum gravity that naturally incorporates a non-unitary evolution causing fundamental decoherence.

Findings

Relational quantum gravity formalism solves the problem of time.

Fundamental decoherence mechanism affects quantum states.

Implication for black hole information paradox.

Abstract

A recently introduced discrete formalism allows to solve the problem of time in quantum gravity in a relational manner. Quantum mechanics formulated with a relational time is not exactly unitary and implies a fundamental mechanism for decoherence of quantum states. The mechanism is strong enough to render the black hole information puzzle unobservable.