A Metaphysical Reflection on the Notion of Background in Modern Spacetime Physics

TL;DR

This paper offers a metaphysical analysis of background structures in spacetime physics, highlighting their interpretative role and explaining the conceptual challenges of background independence.

Contribution

It provides a realist framework for understanding backgrounds in spacetime theories and clarifies their metaphysical significance and associated conceptual difficulties.

Findings

Backgrounds facilitate interpretation of spacetime theories.

Background independence poses significant conceptual challenges.

Background structures are metaphysically contentious but practically useful.

Abstract

The paper presents a metaphysical characterization of spatiotemporal backgrounds from a realist perspective. The conceptual analysis is based on a heuristic sketch that encompasses the common formal traits of the major spacetime theories, such as Newtonian mechanics and general relativity. It is shown how this framework can be interpreted in a fully realist fashion, and what is the role of background structures in such a picture. In the end it is argued that, although backgrounds are a source of metaphysical discomfort, still they make a spacetime theory easy to interpret. It is also suggested that this conclusion partially explains why the notion of background independence carries a lot of conceptual difficulties.