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Demystifier's latest activity
Demystifier
replied to the thread
I
Double slit with particles so heavy that they curve spacetime
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Electrodynamics (interaction of EM field with charged fields) is also nonlinear, but quantum electrodynamics is linear and the...
Apr 29, 2024
Demystifier
reacted to
Kostik's post
in the thread
A
What does Dirac mean by "the suffixes would not balance"?
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Like
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Oops, yes, I got the second derivative wrong. I see exactly what Dirac means by "the suffixes would not balance". Sloppy ... apologies.
Apr 28, 2024
Demystifier
reacted to
Orodruin's post
in the thread
A
What does Dirac mean by "the suffixes would not balance"?
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Like
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No it doesn’t. At least not if done correctly. You cannot have ##\mu## covariant in one term and contravariant in the other. It simply...
Apr 28, 2024
Demystifier
replied to the thread
A
String theory and locality of small dimensions
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For a visualization, consider the surface of a cylinder. It is curled in one direction, but flat in another.
Apr 28, 2024
Demystifier
replied to the thread
A
Feynman rules for Entangled photons
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That's wrong. Have you ever seen any equation in quantum mechanics for a system with two or more particles?
Apr 28, 2024
Demystifier
replied to the thread
A
Feynman rules for Entangled photons
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No, both photons together are "one particle" in 6 dimensions.
Apr 27, 2024
Demystifier
replied to the thread
A
Feynman rules for Entangled photons
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I guess we are talking about nonrelativistic QM, not about QFT. If you have two particles, each moving in 3 dimensions, you can think of...
Apr 26, 2024
Demystifier
reacted to
ohwilleke's post
in the thread
Studying "Useful" vs. "Useless" Stuff in School
with
Wow
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Pluses and minuses. I've never been good at making totally illogical arguments that somehow win the day. Some people are good at that.
Apr 26, 2024
Demystifier
reacted to
Ibix's post
in the thread
A
How do we interpret measurements of Mercury's position?
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Like
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##\phi## does have the same meaning, actually, so that isn't an issue. And we're looking at a rate of change of a ##\phi## coordinate...
Apr 26, 2024
Demystifier
replied to the thread
I
Conservation of energy and wave function collapse
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The observables such as energy, momentum, angular momentum and charge are conserved in the sense that the corresponding operator does...
Apr 26, 2024
Demystifier
reacted to
gentzen's post
in the thread
I
Are there any accepted relativistic interpretations of quantum mechanics?
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Like
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Peter Woit posted an interesting link on February 14, 2024, which might be relevant: Especially the following quote from...
Apr 25, 2024
Demystifier
reacted to
gentzen's post
in the thread
I
Are there any accepted relativistic interpretations of quantum mechanics?
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Like
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The only such "objective-collapse" interpretation I am aware of (which doesn't change the math) is the infamous "consciousness causes...
Apr 25, 2024
Demystifier
replied to the thread
A
What is decoherence?
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That's right.
Apr 25, 2024
Demystifier
reacted to
pines-demon's post
in the thread
A
What is decoherence?
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Like
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Let me see if what I am getting from you two is right. Given the density matrix of a subsystem: $$\rho=\begin{pmatrix} a_{11} &...
Apr 25, 2024
Demystifier
replied to the thread
A
What is decoherence?
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Right, but decoherence cannot be properly understood without its derivation. You can describe decoherence by phenomenological models...
Apr 25, 2024
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