To characterize the possible dispersion of the velocity of light in space (vacuum) a Cauchy-type formula, n²=1+Aν²+Bν², is used. It is shown that relativity only allows a nonzero A term, independent of the nature of the waves or a quantization thereof. Recent experimental data provide upper bounds for A and B, limiting thereby the dispersion in the microwave, infrared, visible, and ultraviolet regions of the spectrum to less than one part in 10²⁰.
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Bay et al. (1972) studied this question.
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