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Clocks and Chronogeometry: Rotating Spacetimes and the Relativistic Null Hypothesis

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Menon Tushar, Linnemann Niels, Read James,
Project New Avenues Beyond Space and Time
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Original article (peer-reviewed)

Journal The British Journal for the Philosophy of Science
Title of proceedings The British Journal for the Philosophy of Science
DOI 10.1093/bjps/axy055


AbstractRecent work in the physics literature demonstrates that, in particular classes of rotating spacetimes, physical light rays in general do not traverse null geodesics. Having presented this result, we discuss its philosophical significance, both for the clock hypothesis (and, in particular, a recent purported proof thereof for light clocks), and for the operational meaning of the metric field. 1Introduction2Fletcher’s Theorem 2.1Maudlin on the clock hypothesis in special relativity2.2Fletcher’s result in special relativity2.3Fletcher’s theorem in general relativity3Electromagnetism and the Geometrical-Optical Limit 3.1Maxwell’s equations in curved spacetime3.2The geometrical-optical limit3.3Rotating spacetimes3.4Aren’t Gödel spacetimes unphysical?4The Clock Hypothesis and Chronogeometry 4.1Natural and mathematical observations4.2Clock registry discord4.3Chronogeometry5Conclusion