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Originally Posted by ExpErdMann
Tensor, I'd like to hear your explanation of what's causing a photon's reddening in the BB model. Tim's explanation that photons are waves within the spacetime medium seemed unorthodox to me. Is it the general opinion nowadays that light waves require a medium to be propagated? I thought this was all heretical.
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Sorry for the delay in answering, things are kinda crazy around here right now.
I happen to agree with and really can't improve on Tim's explanation. I think your confusion comes from thinking that EM radiation is a mechanical wave (like water or sound waves) requiring something physical to move. But, EM waves are not mechanical, nothing is really waving. It's simply the changing electric and magnetic fields producing properties similar to that of a mechanical wave. I also believe (and I may be wrong, if so I apologize), from reading your posts, that you still aren't really fully reconciled with the idea of photons having wave and particle aspects at the same time.