An Entropic Dynamics Approach to Geometrodynamics

TL;DR

This paper develops an entropic dynamics framework that unifies quantum mechanics and classical general relativity by allowing spacetime geometry to dynamically participate, providing a first-principles approach to quantum gravity.

Contribution

It extends entropic dynamics to include spacetime geometry, bridging quantum theory and general relativity within a covariant inference-based framework.

Findings

Reproduces quantum mechanics in one limit.

Recovers classical general relativity in another limit.

Provides a covariant, inference-based model of quantum gravity.

Abstract

In the Entropic Dynamics (ED) framework quantum theory is derived as an application of entropic methods of inference. The physics is introduced through appropriate choices of variables and of constraints that codify the relevant physical information. In previous work, a manifestly covariant ED of quantum scalar fields in a fixed background spacetime was developed. Manifest relativistic covariance was achieved by imposing constraints in the form of Poisson brackets and of intial conditions to be satisfied by a set of local Hamiltonian generators. Our approach succeeded in extending to the quantum domain the classical framework that originated with Dirac and was later developed by Teitelboim and Kuchar. In the present work the ED of quantum fields is extended further by allowing the geometry of spacetime to fully partake in the dynamics. The result is a first-principles ED model that in one limit reproduces quantum mechanics and in another limit reproduces classical general relativity. Our model shares some formal features with the so-called semi-classical approach to gravity.