Quote:
Originally Posted by john hunter
Dear Fortis,
Yes, it's the time that would be measured by a clock on the object, moving with the object. The photon has no rest mass, so it can't conserve energy by gravitation, if no time passes for it, its energy remains constant, which manifests itself as a change in frequency.
John Hunter.
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A couple of things.
1) If it's energy does not change then how does gravitational redshift work?
2) Due to random motion, there will be a spread in the proper times. Why do we not observe this spread in the spectral lines from distant objects?