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I was hoping somebody could point me towards a derivation of the following formula for cosmological redshift:
z = R(t0)/R(te)-1.
Wikipedia just presents the formula as a fait accompli and the only explanation is a vague reference to "stretched photons", which is not helpful.
I was hoping there is a fairly simple explanation of why the redshift is related to the ratio of the cosmological scale parameters, but so far I haven't found one.
Thanks very much.
z = R(t0)/R(te)-1.
Wikipedia just presents the formula as a fait accompli and the only explanation is a vague reference to "stretched photons", which is not helpful.
I was hoping there is a fairly simple explanation of why the redshift is related to the ratio of the cosmological scale parameters, but so far I haven't found one.
Thanks very much.