PeterDonis's latest activity
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PeterDonis replied to the thread I Question about discussions around quantum interpretations.Not quite. It's true that "deterministic, but with epistemic uncertainty" forces you to accept something like the Bohmian... -
PeterDonis replied to the thread I Question about discussions around quantum interpretations.But there are QM interpretations where the results are epistemic and the assumptions you refer to are violated. For example, the Bohmian...
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PeterDonis replied to the thread I Euclidean geometry and gravity.You still haven't shown the math of how you pick these out from other stresses. And, as I pointed out in a post some time ago, and...
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PeterDonis replied to the thread I Euclidean geometry and gravity.No, this is not correct. If you apply external forces to each part of the object sufficient to account for the proper acceleration of...
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PeterDonis replied to the thread I Euclidean geometry and gravity.I think their claim is more limited than that. De Sitter spacetime has a timelike KVF, and a Killing motion using that KVF can certainly...
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PeterDonis replied to the thread I Euclidean geometry and gravity.Ah, ok. I don't think that's what @Ibix was describing: he was describing setting up a static network of rockets in Schwarzschild...
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PeterDonis replied to the thread I Euclidean geometry and gravity.Which congruence are you referring to? The one that describes moving the structure from flat spacetime to curved spacetime?
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PeterDonis replied to the thread I Euclidean geometry and gravity.Ah, got it, thanks! The key point is that the form given by Moller (1952) explicitly shows that the orthogonal spatial slices are flat...
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PeterDonis replied to the thread I Euclidean geometry and gravity.Wouldn't this violate the H-N theorem if it were true?
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PeterDonis replied to the thread I Euclidean geometry and gravity.If the proper acceleration of each worldline is not constant, the congruence is not stationary.
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PeterDonis replied to the thread I Euclidean geometry and gravity.Hm. This congruence would be irrotational, but I don't think its orthogonal hypersurfaces would be flat. So it would not meet the...
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Ok, that is fine. However, what is true includes that, in an invariant sense, you can't place the rockets in the new locations at the...
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PeterDonis replied to the thread I Euclidean geometry and gravity.I think the intent was to have the same physical threads in the second case--that you would take the structure built in flat spacetime...
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Perhaps a slightly different experiment might help. Consider a flock of small rockets. Initially they are at rest far from a black hole...
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PeterDonis replied to the thread I Euclidean geometry and gravity.But what does that relaxed proper length depend on? You seem to be saying that, if I build two beams of the exact same material, one in...
