Prima Facie Questions in Quantum Gravity

TL;DR

This paper analyzes fundamental questions in quantum gravity, focusing on background structures, spacetime diffeomorphisms, and the problem of time to classify different approaches.

Contribution

It provides a framework for evaluating quantum gravity schemes through prima facie questions related to their conceptual and technical foundations.

Findings

Clarifies the importance of background structures in quantum gravity

Highlights the role of spacetime diffeomorphisms in different approaches

Examines the problem of time and its implications for quantum gravity

Abstract

The long history of the study of quantum gravity has thrown up a complex web of ideas and approaches. The aim of this article is to unravel this web a little by analysing some of the {\em prima facie\/} questions that can be asked of almost any approach to quantum gravity and whose answers assist in classifying the different schemes. Particular emphasis is placed on (i) the role of background conceptual and technical structure; (ii) the role of spacetime diffeomorphisms; and (iii) the problem of time.