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Originally Posted by JimJast
But it as not Einstein's idea but only cosmologists' who insist that Hubble redshift is Doppler.
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Why do you keep saying that cosmologists insist on Hubble redshift being Doppler? AFAIK, mainstream science doesn't say that at all. I fear you have been batting at a strawman:
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In the early part of the twentieth century, Slipher, Hubble and others made the first measurements of the redshifts and blue shifts of galaxies beyond the Milky Way. They initially interpreted these redshifts and blue shifts as due solely to the Doppler effect, but later Hubble discovered a rough correlation between the increasing redshifts and the increasing distance of galaxies. Theorists almost immediately realized that these observations could be explained by a different mechanism for producing redshifts. Hubble's law of the correlation between redshifts and distances is required by models of cosmology derived from general relativity that have a metric expansion of space. As a result, photons propagating through the expanding space are stretched, creating the cosmological redshift. This differs from the Doppler effect redshifts described above because the velocity boost (i.e. the Lorentz transformation) between the source and observer is not due to classical momentum and energy transfer, but instead the photons increase in wavelength and redshift as the space through which they are traveling expands.
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(bold mine)
http://en.wikipedia.org/wiki/Redshif...nsion_of_space