Re: GR frequency shift formula


Tom Roberts wrote:
vanep@xxxxxxx wrote:
Clocks tick at different rates due to their position in the
gravitational field and the total photon energy remains constant as it
changes position in the gravitational field.

I repeat: that is _one_ way to interpret the equations of GR. But it is
not the only one. Both rate and energy are coordinate-dependent
quantities and you are implicitly assuming a specific coordinate system
here; use different coordinates and you can get different results for
clock tick rates and "photon" energy.

I don't dispute that. The 'loss of energy' interpretation can lead to
misrepresentation such as Marcel made. My impression of Marcels
comments is he might conclude that GR predicts proper clock rates are
coordinate-dependent.



In particular if you use coordinates local to source and others local to
detector, both determined by standard clocks and rulers, you will
conclude that clocks tick at the same rate and "photons" gain or lose
energy/frequency. In some sense these are more natural coordinates than
the ones you assumed for your statement above (your coordinate clocks
are not standard).

I ignore the quantum aspects of photons; consider light rays
instead and measure their frequencies.


Tom Roberts tjroberts@xxxxxxxxxx

.

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