Summary
We show that the response of an interferometric device to a monochromatic gravitational wave results from two different contributions: one due to the change of space geometry (mirror motion) and the other one due to the change of time rate (photon red- or blue-shift). An alternative exact derivation of phase shift is given.
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Fortini, P., Ortolan, A. Light phase shift in the field of a gravitational wave. Nuovo Cim B 106, 101–104 (1991). https://doi.org/10.1007/BF02723131
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DOI: https://doi.org/10.1007/BF02723131