Empirical evidences in favor of a varying-speed-of-light

Details Empirical evidences in favor of a varying-speed-of-light Empirical evidences in favor of a varying-speed-of-light

2009-08-03

arxiv.org/abs/0908.0249v4

EPL 2009, vol.88, 59002

Physics

General Physics

9 pages, 2 figures, 1 table; a few more details

Scientific paper

10.1209/0295-5075/88/59002

The empirical evidences in favor of the hypothesis that the speed of light decreases by a few centimeters per second each year are examined. Lunar laser ranging data are found to be consistent with this hypothesis, which also provides a straightforward explanation for the so-called Pioneer anomaly, that is, a time-dependent blue-shift observed when analyzing radio tracking data from distant spacecrafts, as well as an alternative explanation for both the apparent time-dilation of remote events and the apparent acceleration of the Universe. The main argument against this hypothesis, namely, the constancy of fine-structure and Rydberg constants, is discussed. Both of them being combinations of several physical constants, their constancy imply that, if the speed of light is indeed time-dependent, then at least two other "fundamental constants" have to vary as well. This defines strong constraints which will have to be fulfilled by future varying-speed-of-light theories.

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