Universal quantum mechanics

TL;DR

This paper proposes a generalized quantum framework that incorporates gravitational phenomena, suggesting that space and time may be emergent and relational, and modifies standard quantum postulates to include quantum gravity features.

Contribution

It introduces a novel quantum framework that potentially unifies quantum mechanics with gravity by relaxing traditional postulates about time and measurement.

Findings

Framework accommodates emergent space and time

Relational and approximate nature of spacetime in quantum gravity

Discusses structure beyond local quantum field theory

Abstract

If gravity respects quantum mechanics, it is important to identify the essential postulates of a quantum framework capable of incorporating gravitational phenomena. Such a construct likely requires elimination or modification of some of the "standard" postulates of quantum mechanics, in particular those involving time and measurement. This paper proposes a framework that appears sufficiently general to incorporate some expected features of quantum gravity. These include the statement that space and time may only emerge approximately and relationally. One perspective on such a framework is as a sort of generalization of the S-matrix approach to dynamics. Within this framework, more dynamical structure is required to fully specify a theory; this structure is expected to lack some of the elements of local quantum field theory. Some aspects of this structure are discussed, both in the context of scattering of perturbations about a flat background, and in the context of cosmology.