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Or the experiment that I suggest as to placing clocks at different locations at same elevation, but of different geological density would also be 'just' a variation of g.
.. too obvious.
The difference in my model is that the galaxies that make up the galaxy clusters have been, and still are moving closer together as time passes, and this will change the field that the light travels through. The entire field. And it is these changes in the entire field that cause the greater part of the shift of redshift observations (in my model).
But the source and the receiver are not the only masses affecting the gravity of the intervening field between.
@Colin2B. I already stated 10 times now that points of mass that the light moves past along its journey will not affect the redshift observation at receiver. Not in my model, nor anyone else's.
What those points of mass are doing with respect to each other will however affect the magnitude of the gravity field between 'all of' the masses.
A more distant object will have a greater redshift than a closer object, this being b/c the light has spent a longer time in the field than the light from the nearer object has. If the light has spent more time in a weakening field, the redshift will be greater.
Unfortunately, Wetterich's theory can't be tested because of the relative nature of mass. Everything we are able to see has a mass that is relative in size to everything else. Thus if it's all growing, we wouldn't have anything to measure it against to see that it's happening.
in a universe that is 'contracting' under the influence of gravity, an observation of light from a distant galaxy cluster will be redshifted, and light arriving from more distant galaxy clusters will be further redshifted, b/c that light was emitted at a point in history that pre-dates the light emitted from the closer galaxy.