Abstract
A 5D Kaluza-Klein type extension of General Relativity with variable rest mass was proposed by Wesson [9]. This theory has been worked on by several people, including Grøn and Soleng [24]. Comments are made to clarify the status of this theory, and the objections of Grøn and Soleng in particular are countered. Suggestions for further work are made.
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Wesson, P.S. Clarification of an extended theory of gravity and a reply to Grøn and Soleng. Gen Relat Gravit 22, 707–713 (1990). https://doi.org/10.1007/BF00755989
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DOI: https://doi.org/10.1007/BF00755989