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Originally Posted by Grey
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Originally Posted by worzel
That's a bit harsh isn't it? Surely if the tired light theory is flawed it is because it can't be consistent internally and w.r.t. observations, not because some analogy doesn't seem very good. There's a big hole in the balloon analogy of an expanding universe - you gotta get the air in somehow  |
Well, no, I don't think it's harsh, since all he's got at the moment is an analogy, so there's nothing more to discuss.  I don't want to suggest that the whole idea of tired light fails because this particular analogy isn't good, but he did specfically ask if anyone saw any problems with the analogy. |
Another way to evaluate my proposal would be to compare how redshift mechanisms correlate with time dilation in the various situations where they are encountered.
As mentioned above, the original prediction about time dilation in SNe was based on the classical Doppler shift, using supposed recessional velocities. In this case the time dilation factor is (1 + z).
In SR, the time dilation factor is also (1 + z). Here the redshift has a term in v^2/c^2, unlike the classical Doppler, but the time dilation factor (1 + z) is the same.
For the gravitational redshift, I'm not sure if the same relation holds as far as the Shapiro effect is concerned. Would appreciate it if anyone can clarify this one.
My suggestion that the redshift could come about through weakening of spacetime is not developed enough to make this comparison as yet, but on the basis of the above I'm thinking that anywhere a redshift occurs a time dilation effect will also occur and that the former determines the magnitude of the latter.