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Demystifier's latest activity
Demystifier
reacted to
pines-demon's post
in the thread
I
When and why can ∂p/∂t=0 in position space?
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This is problem 3.37 from the 3ed: The time derivative is outside the angle brackets in Eq. (3.112). Note that it says that for a...
Today, 6:00 AM
Demystifier
replied to the thread
I
Supressing black hole evaporation?
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Is analogue Hawking radiation, namely radiation of phonons in systems with sonic horizon, "known" physics?
Yesterday, 11:17 PM
Demystifier
replied to the thread
I
Supressing black hole evaporation?
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Then something less mundane https://arxiv.org/abs/1311.4363
Sunday, 12:01 AM
Demystifier
replied to the thread
I
Supressing black hole evaporation?
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How about putting spherical mirror around the black hole?
Saturday, 11:52 PM
Demystifier
replied to the thread
A
x measurement modeled in non-separable Hilbert space
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The norm that you consider, as a function of ##a##, has a jump at ##a=0##. Therefore you cannot find the value at ##a=0## by considering...
Friday, 10:27 PM
Demystifier
replied to the thread
A
"The 7 Strangest Coincidences in the Laws of Nature" (S. Hossenfelder)
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Yes.
Thursday, 10:29 PM
Demystifier
reacted to
PeroK's post
in the thread
B
Why don't cars accelerate according to F = ma?
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Interestingly, that was what everyone thought before Newton. That it takes a force to maintain constant motion. And, in the absence of...
Apr 30, 2024
Demystifier
reacted to
PeterDonis's post
in the thread
A
Feynman rules for Entangled photons
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Yes, there are. They just don't mean what your thread title implies that they mean, as @Demystifier pointed out in post #26. We don't...
Apr 30, 2024
Demystifier
reacted to
Vanadium 50's post
in the thread
A
Feynman rules for Entangled photons
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This is why I asked him Saturday if he had ever done such a calculation and if he really wanted a graduate-level answer. Based on his...
Apr 30, 2024
Demystifier
replied to the thread
A
Feynman rules for Entangled photons
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Yes, but in that case you are no longer considering two photons. And by the way, the expression "Feynman rules" means something entirely...
Apr 30, 2024
Demystifier
replied to the thread
A
Feynman rules for Entangled photons
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When you have two entangled photons, there is no such thing as amplitude of photon 1. There is only an amplitude for both photons together.
Apr 29, 2024
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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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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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
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