I am pretty sure it is gamma^2, not 2x(gamma). It is very easily obtained from the Schwarzschild metric by setting ds=0 for a photon and solving for dr/dt.Yes . The change referred to in my above quote was specifically change in frequency I.e. red/blue shift,,the subject of inquiry. Not a suggestion that other changes didn't occur but that they weren't relevant.
You have provided a nice description of why they aren't relevant to red shift ,
I understood that the change in coordinate speed c was 2x(gamma) not gamma^2.
Is this incorrect?
I have always wondered how I would do that and hoped know one would ever put me on the spot and ask me that directly. Damn you! :PPS Do you have some good idea how to actually measure the wavelength of photons with our contracted rulers :-)
Seriously, does anyone know if it is possible to measure wavelength directly, rather than infer it indirectly from frequency?