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Suppose at the instant a gravitational wave passes through an interferometer, one of the interferometer's arm get stretched by 1%. Would the wavelength of the photon traveling in the arm also get stretched by 1%? If so, then would the frequency of the photon remain the same and hence increasing the velocity of the photon? Could the velocity of the photon be >c, just like how distant galaxies can move faster than c due to the expansion/stretching of space? If the velocity of the photon is higher, then why would it take a longer time to travel down the arm when space is stretched?
It's mentioned here @5:50 that the wavelength get stretched:
It's mentioned here @5:50 that the wavelength get stretched:
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