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Originally Posted by Tim Thompson
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Ok Tim, I need a hand here with a concept/statement that I simply can't make heads or tails of from a physics point of view.
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The general relativistic interpretation of the expansion interprets cosmological redshifts as an indication of velocity since the proper distance between comoving objects increases. However, the velocity is due to the rate of expansion of space, not movement through space, and therefore cannot be calculated with the special relativistic Doppler shift formula. Hubble & Humason’s calculation of velocity therefore should not be given special relativistic corrections at high redshift, contrary to their suggestion [App. B: 16].
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From a QM and GR perspective, I have no idea what they are talking about when they talk about "space" somehow "expanding". Spacetime can "expand" as the particles of mass expand, but the term "space" here has no clear meaning in terms of GR, QM or particle physics. What exactly does that mean? Does the space between subatomic particles expand? Does the earth expand, or does this expansion take place only where we can't test it? How does this author
know that the velocity is due to the rate of the expansion of space? Can you define the term "space" here in a way that relates to GR or QM? What is "expanding" exactly?