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The word 'ether' has had several meanings throughout the history of science. For example, regarding your question, look at what Einstein...

That's irrelevant, because the KE is computed in the laboratory frame (not in the disk frame), where the spatial geometry is Euclidean.

Compute the integral in the interval ##[R-\epsilon R,R]## for small ##\epsilon##, it should explain what's going on.

In your formula K=M for ##\omega R=1##. I think that even the rim part speed reaches light speed, its element contribution is...

Ahh, just found a translated version! 🙌🏼...

That's a physical inevitability. Nevertheless, the kinetic energy of a spinning disk tends to infinity as the speed of rotation tends to...

Here is a demonstration:

Not really the answer to the OP's question, but an interesting observation. Assuming that the mass squared $$m^2=p^{\mu}p_{\mu}$$ does...

Always. An extended object should always be interpreted as a collection of separate objects, even if there is no relative motion between...

Yes, but I think the right question is this: Can general relativity (GR) "change" topology? Or more precisely, is GR a theory of the...

He says "associated with". Why not just "is"? Because actually, no, the position he describes is not Everett's relative state...

If he doesn't like the Everett type interpretation, then why (at the bottom of page 7) does he say "The position I am going to advocate...

Maybe he does not explain it very well, but since now I'm in the charitable mood, I tend to interpret it as an implicit assumption of an...

For a change, let me now try to analyze the Coleman's argument by using the charity principle...

I argued that Coleman assumed interpretation B, according to which the observer does not distinguish different straight trajectories. It...