"Broadens Understanding of Science"
From Optonics and Photonics Focus, February 18 2010:
Is Light slowing Down?
The speed of light is a universal constant — or is it? Some evidence seems to suggest it might actually be slowing down. Will we soon have to revise our cosmological beliefs?
If light were slowing down, we would have to revise many of our astronomical beliefs: from the age of the Universe to the distances between galaxies, from the dark matter to the definition of many physical constants. What a tremendous set of implications! Some evidence that this might indeed be the case starts piling up, as recently reported by Yves-Henri Sanejouand from the University of Nantes in France.
From Vertical News:
Research from Y.H. Sanejouand et al broadens understanding of science
2010 JAN 26 - (VerticalNews.com) -- According to a study from France, "Possible 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 implies that, if the speed of light is indeed time-dependent, then at least two other ''fundamental constants'' have to vary as well," wrote Y.H. Sanejouand and colleagues.
The researchers concluded: "This puts severe constraints on the development of any future varying-speed-of-light theory."
Sanejouand and colleagues published the results of their research in Epl (About some possible empirical evidences in favor of a cosmological time variation of the speed of light. Epl, 2009;88(5):59002).