Cambridge Core: J. L. Synge, "Whittaker's Contributions to the Theory of Relativity" (1958)

Visit: 2026-10-07, Investigator run (STEP I). Listed under "Not yet tried" in the Q07 keywords. Query: Google Whittaker "influence of gravitation on electromagnetic phenomena" Nature 1928. The Cambridge PDF link was in the results. PDF: https://www.cambridge.org/core/services/aop-cambridge-core/content/view/E9F4D8200DF646005DBA3D7564438B2B/S0013091500014371a.pdf/whittakers_contributions_to_the_theory_of_relativity.pdf . doi 10.1017/S0013091500014371, Proc. Edinburgh Math. Soc. (Whittaker memorial issue), 17 pp. Read through the web-fetch tool's local copy with pdftotext (text layer present). Not copied into research/files/: downloading needs the owner's approval.

Content [web: PDF text]

Synge (Dublin Institute for Advanced Studies) reviews "TEN papers ... and all are concerned in some way with electromagnetism", in date order: - (a) "On tubes of electromagnetic force", Proc. R. Soc. Edin. 42 (1921) 1-23. Electropotential and magnetopotential surfaces, Lorentz-invariant analogues of Faraday tubes. - (b) "On Hilbert's world-function", Proc. R. Soc. A 113 (1927) 496-511. Whittaker "did not take kindly to the ideas of quantum theory, and thought that light quanta should be explained within Maxwellian theory, enlarged by the inclusion of magnetic currents". Synge on the claim of finite light-pulses: "a surprising statement, as to the validity of which one may entertain some scepticism", and "I have not been able to get to the heart of the matter." - (c) "On electric phenomena in a gravitational field", Proc. R. Soc. A 116 (1927) 720-735. Electromagnetic fields superimposed on a space-time of fixed geometry satisfying Einstein's vacuum equations; the Schwarzschild field. - (d) "Note on the law that light-rays are the null geodesics in a gravitational field" (1928). - (e) "The influence of gravitation on electromagnetic phenomena", J. London Math. Soc. 3 (1928) 137-144. A lecture in which Whittaker compares "electromagnetic theory in a gravitational field to Maxwellian theory in a medium whose specific inductive capacity and magnetic permeability vary from point to point, but noting that the resemblance is not quite perfect"; null geodesics in the Schwarzschild field, including the rays "spirally asymptotic to the circle r = 3a/2" (the photon sphere). - (g) on distance in curved space; (i) "On Gauss' theorem and the concept of mass in general relativity"; (j) "On the relations of the tensor-calculus to the spinor-calculus" (with a vector form of Dirac's equation). - The 1902-03 undulatory gravity idea does not appear in Synge's review, and neither "aether" nor "ether" appears in the text.

Bearing

• Claim 4 and Q07: Whittaker's later gravity work (1921-1940) is all inside general relativity. The link to the Q07 hypothesis is (e): in 1928 Whittaker himself compared gravity's effect on light to a medium with variable permittivity and permeability. That is the idea behind the Dicke 1957 / Puthoff polarizable-vacuum model weighed in A07. Whittaker added that "the resemblance is not quite perfect". This is a lead for the A07 equation table: Dicke was preceded, at least in this analogy, by Whittaker 1928 (and, in the general literature, by Eddington 1920 [memory: medium confidence]).
• Synge's scepticism about (b) is a peer's judgement and stays in the record.