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pervect's latest activity
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pervect
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Trying to calculate proper time of worldlines using rotating frames
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If you were to use tensor methods, you would calculate ds from the formula $$ds^2 = g_{\mu\nu} dx^{\mu}dx^{\nu}$$ (So, to get ds, you...
Sep 17, 2025
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pervect
replied to the thread
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Symmetry of motion in the special theory of relativity
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So far, so good. You have described the symmetry principle of relativity well. And it is indeed puzzling how this is possible - at...
Sep 13, 2025
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pervect
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How do Tensors "work" in relation to linear algebraic objects?
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Are you familiar with the concept of dual vectors? I suspect that this may be the underlying issue you are struggling with. Here's the...
Sep 8, 2025
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pervect
replied to the thread
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Confused about time dilation -- motion vs energy
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As others have pointed out, it's a bit more complicated than that. I'm guessing that you are assuming there is some state of "absolute...
Sep 7, 2025
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pervect
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Bloch Sphere generalization for more than one qubit
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I ran across the very interesting https://arxiv.org/abs/quant-ph/0302081, "Geometry of the 3-Qubit State, Entanglement and Division...
Aug 30, 2025
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pervect
replied to the thread
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1-Way Speed of Light
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In my opinion arguments over or about the one way speed of light are pretty much a dead end, but rereading the post I see Peter was...
Aug 27, 2025
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pervect
replied to the thread
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1-Way Speed of Light
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Is clock syncrhronization actually important to your question? It's not obvious to me why it's relevant to your problem, and it'd be a...
Aug 27, 2025
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pervect
replied to the thread
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What reference frame is used for the velocity v in the Lorentz transformation?
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Because to OP is talking about "reference frames", they are most likely doing Newtonian physics and not actually doing GR. If they...
Aug 21, 2025
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pervect
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How do non-diagonal indices of a metric allow for local flatness?
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Consider the Euclidean metric of a plane, dx^2 + dy^2 = 0. Formally, this would actually be called a line element, mea culpa. Any...
Aug 20, 2025
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pervect
posted the thread
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Bloch Sphere generalization for more than one qubit
in
Quantum Physics
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In https://web.cecs.pdx.edu/~mperkows/june2007/bloch-sphere.pdf, Ian Glendinning describes a derivation of the Bloch sphere for one...
Aug 13, 2025
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pervect
replied to the thread
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Gravitation (MTW) Misner Thorne Wheeler - 50 years (RIP) C.W.Misner
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Can you really read the formulae and the diagrams on the Kindle version? I would think it'd be tough to get much out of it :(.
Aug 6, 2025
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