Abstract
A previous analysis of the consequences of a violation of the strong equivalence principle (SEP) for massive particles has now been extended to the case of photons and leads to the prediction that the photon number is conserved. Comparison of the predictions of our theory with observations, especially those on big-bang nucleosynthesis, shows that a violation of the SEP is not ruled out by the data available, and that further direct measurements are required.
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Canuto, V., Goldman, I. Astrophysical consequences of a violation of the strong equivalence principle. Nature 304, 311–315 (1983). https://doi.org/10.1038/304311a0
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DOI: https://doi.org/10.1038/304311a0
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