Relativity and Cosmology


Sagnac Effect on Inertial Motion

Authors: Eric Su

Wang, Zheng, and Yao carried out an experiment in 2004 to determine if the Sagnac effect can be applied to the inertial motion. Their experiment showed that there was indeed phase difference between the two light beams passing through the same optical fiber in inertial motion. However, the focus of their experiment was on the rest frame of the light source. They did not realize that the time difference from the phase difference should exist in all reference frames. The difference in the elapsed time taken by two light beams to pass through the linear fiber segment in the rest frame of the segment effectively corresponds to the speed difference between two light beams. The Sagnac effect in inertial motion provides a precise experimental evidence that the speed of light is different in a different reference frame.

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Submission history

[v1] 2019-08-19 23:08:34
[v2] 2019-08-27 00:24:37

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