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Paper: On the Origin of Kaluza’s Idea of Unification
Volume: 370, Solar and Stellar Physics Through Eclipses
Page: 363
Authors: Verbin, Y.; Nielsen, N.K.
Abstract: We argue that the starting point of Kaluza’s idea of unifying electrodynamics and gravity was the electromagnetic form which the general relativistic equations get for fields of slowly varying sources that was pointed out by Einstein and Thirring. It seems that Kaluza’s attention was turned to this point by the three papers on the Lense-Thirring effect and the analogy between gravitation and electromagnetism which were published a short time before Kaluza’s paper was submitted. This observation has also a pedagogic aspect in that it may serve as an alternative starting point for introducing the Kaluza-Klein theory.
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