Quantum gravity: Meaning and measurement

John Stachel
Boston University
A discussion of the meaning of a physical concept cannot be separated from discussion of the conditions for its ideal measurement. We assert that quantization is no more than the invocation of the quantum of action in the explanation of some process or phenomenon, and does not imply an assertion of the fundamental nature of such a process. This leads to an ecumenical approach to the problem of quantization of the gravitational field. There can be many valid approaches, each of which should be judged by the domain of its applicability to various phenomena. If two approaches have overlapping domains, the relation between them then itself becomes a subject of study. We advocate an approach to general relativity based on the unimodular group, which emphasizes the physical significance and measurability of the conformal and projective structures. A discussion of the method of matched asymptotic expansions, and of the weakness of terrestrial sources compared with astrophysical and cosmological sources, leads us to suggest theoretical studies of gravitational radiation based on retrodiction rather than prediction
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DOI 10.1016/j.shpsb.2013.12.002
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References found in this work BETA

Bohr and the Photon.John Stachel - 2009 - In Wayne C. Myrvold & Joy Christian (eds.), Quantum Reality, Relativistic Causality, and Closing the Epistemic Circle. Springer. pp. 69--83.
Do Quanta Need a New Logic?John Stachel - 1986 - In Robert G. Colodny (ed.), From Quarks to Quasars: Philosophical Problems of Modern Physics. University of Pittsburgh Press. pp. 229--347.
Feynman Paths and Quantum Entanglement: Is There Any More to the Mystery?John Stachel - 1997 - In Robert S. Cohen, Michael Horne & John Stachel (eds.), Potentiality, Entanglement and Passion-at-a-Distance. Kluwer Academic Publishers. pp. 245--256.

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