Abstract
IT is generally believed that the general theory of relativity is a theory of gravitation which treats only the case for which the Newtonian attraction between particles m 1, m 2 at a distance d apart is γm 1 m 2/d 2, where γ is a constant, and that the case when γ is replaced by a variable quantity γ′ is beyond the scope of the theory. I do not believe that this is the case, and in the following argument I endeavour to show that the general theory of relativity can, in fact, treat the case when γ′ is a slowly varying function of the time, of the type found in Dirac's cosmology1.
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References
Dirac, P. A. M., Proc. Roy. Soc., A, 165, 199 (1938).
McCrea, W. H., and Milne, E. A., Quart. J. Math. (Oxford), 5, 73 (1934).
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GILBERT, C. The General Theory of Relativity and Newton's Law of Gravitation. Nature 179, 270 (1957). https://doi.org/10.1038/179270a0
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DOI: https://doi.org/10.1038/179270a0
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