pervect's latest activity
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Ppervect replied to the thread I Bloch Sphere generalization for more than one qubit.I ran across the very interesting https://arxiv.org/abs/quant-ph/0302081, "Geometry of the 3-Qubit State, Entanglement and Division...
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Ppervect replied to the thread A 1-Way Speed of Light.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...
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Ppervect replied to the thread A 1-Way Speed of Light.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...
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Ppervect replied to the thread B What reference frame is used for the velocity v in the Lorentz transformation?.Because to OP is talking about "reference frames", they are most likely doing Newtonian physics and not actually doing GR. If they...
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Ppervect replied to the thread I How do non-diagonal indices of a metric allow for local flatness?.Consider the Euclidean metric of a plane, dx^2 + dy^2 = 0. Formally, this would actually be called a line element, mea culpa. Any...
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PIn https://web.cecs.pdx.edu/~mperkows/june2007/bloch-sphere.pdf, Ian Glendinning describes a derivation of the Bloch sphere for one...
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Ppervect replied to the thread I Gravitation (MTW) Misner Thorne Wheeler - 50 years (RIP) C.W.Misner.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 :(.
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Ppervect reacted to PAllen's post in the thread B Time dilation for two clocks at different altitudes on Earth with
Like.
If you imagine two places on earth such that the total work to raise a small body from the surface to very far from earth was greater at... -
Ppervect replied to the thread I How does GR deal with pointlike objects with mass?.I would say that your characterization of GR as saying that "the planet is stretching" is flawed. But lets move on to your question...
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Ppervect replied to the thread I How to calculate basis vectors from metric tensor (as a matrix)?.A recap of what others said. If one defines coordinates on a manifold, (to be more formal, one might talk about a coordinat chart), one...
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Ppervect replied to the thread A Tensors in null basis.When talking about directions, I've had arguments in the past about whether a "spacelike" direction is a vector, like ##\partial /...
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Ppervect replied to the thread B Oberth Effect Near Sag A*.I can quote some of the equations you need for a Schwarzschild black hole, I don't know how good an approximation that is for Sag A*...
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Ppervect replied to the thread A "TImescape" models.Thanks - I did find the thread interesting. The previous papers had too much distracting wordage on things I found irrelevant, like...
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Ppervect replied to the thread A "TImescape" models.Thanks for the links. I'm not too impressed by the approach itself at this point if the papers are representative of it, but that's a...