Pre-socratic quantum gravity

In Craig Callender & Nick Huggett (eds.), Physics Meets Philosophy at the Planck Scale. Cambridge University Press. pp. 213--55 (2001)
  Copy   BIBTEX


Physicists who work on canonical quantum gravity will sometimes remark that the general covariance of general relativity is responsible for many of the thorniest technical and conceptual problems in their field.1 In particular, it is sometimes alleged that one can trace to this single source a variety of deep puzzles about the nature of time in quantum gravity, deep disagreements surrounding the notion of ‘observable’ in classical and quantum gravity, and deep questions about the nature of the existence of spacetime in general relativity. Philosophers who think about these things are sometimes skeptical about such claims. We have all learned that Kretschmann was quite correct to urge against Einstein that the “General Theory of Relativity” was no such thing, since any theory could be cast in a generally covariant form, and hence the general covariance of general relativity could not have any physical content, let alone bear the kind of weight that Einstein expected it to.2 Friedman’s assessment is widely accepted: “As Kretschmann first pointed out in 1917, the principle of general covariance has no physical content whatever: it specifies no particular physical theory; rather, it merely expresses our commitment to a certain style of formulating physical theories” (1984, p. 44). Such considerations suggest that general covariance, as a technically crucial but physically contentless feature of general relativity, simply cannot be the source of any significant conceptual or physical problems.3 Physicists are, of course, conscious of the weight of Kretschmann’s points against Einstein. Yet they are considerably more ambivalent than their philosophical colleagues. Consider Kuchaˇr’s conclusion at the end of a discussion of this topic.



    Upload a copy of this work     Papers currently archived: 86,403

External links

Setup an account with your affiliations in order to access resources via your University's proxy server

Through your library


Added to PP

217 (#75,358)

6 months
7 (#140,800)

Historical graph of downloads
How can I increase my downloads?

Author Profiles

John Earman
University of Pittsburgh
Gordon Belot
University of Michigan, Ann Arbor

Citations of this work

Diamonds are Forever.Cian Dorr & Jeremy Goodman - 2019 - Noûs 54 (3):632-665.
How to Be a Spacetime Substantivalist.Trevor Teitel - 2022 - Journal of Philosophy 119 (5):233-278.
Quantum states for primitive ontologists: A case study.Gordon Belot - 2012 - European Journal for Philosophy of Science 2 (1):67-83.

View all 30 citations / Add more citations

References found in this work

No references found.

Add more references