Demystifier's latest activity
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Demystifier reacted to bhobba's post in the thread Quantum "WHAT IS A QUANTUM FIELD THEORY?" A First Introduction for Mathematicians with
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The book is fascinating. If your education includes a typical math degree curriculum, with Lebesgue integration, functional analysis... -
Demystifier replied to the thread Undergrad Gauss' law seems to imply instantaneous electric field propagation.That's an illegitimate assumption unless ##q(t)## is ##t##-independent. If ##q(t)## depends on ##t## then the charge is not conserved...
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Demystifier replied to the thread Undergrad The Extended Wigner's Friend Scenarios.What do you mean by electron path? It's not even defined, except in the Bohmian interpretation. Since the thought experiment is defined...
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Demystifier reacted to Nugatory's post in the thread Undergrad Commutation of operators for particle in a box with Like.
Does it? We have ##[H,P]=[P^2/2m,P]+[V(x),P]##; the first term is trivially zero but there’s no reason to expect the second one to be...
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Demystifier replied to the thread Undergrad Schrödinger equation and classical wave equation.Schrodinger didn't know what is the physical meaning of the wave. He only used the nonrelativistic energy formula $$E=\frac{p^2}{2m}+...
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Demystifier replied to the thread Undergrad Why can’t photons “pile up” to eject an electron?.If you draw the Feynman diagrams for absorption of one and two photons, you see that they have one and two vertices, respectively, so...
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Demystifier reacted to willyengland's post in the thread Undergrad Why can’t photons “pile up” to eject an electron? with Like.
A multi-photon absorption might happen I think under extreme conditions like a strong laser.
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Demystifier replied to the thread Undergrad A very interesting paper on orthodox quantum mechanics.Pop science QM is written by actual physicists. They give the best explanation they can under the constraint of not using equations. So...
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Demystifier replied to the thread Undergrad A very interesting paper on orthodox quantum mechanics.I don't think there is any difference between QM and QFT in that sense. You can certainly think of QFT in terms of ensemble, after all...
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Demystifier reacted to syed's post in the thread Undergrad Do ensemble-based predictions truly describe real finite systems? with Like.
Thank you for the detailed explanation
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Demystifier reacted to Chestermiller's post in the thread Undergrad Entropy and configurations of microstates with Like.
In statistical thermodynamics, the following approximation is frequently used: $$\ln{(n!)}=\ln(1)+\ln(2)...\ln(n-1)+\ln(n)\approx...
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Demystifier replied to the thread Undergrad Do ensemble-based predictions truly describe real finite systems?.There is a simple but general principle how to determine whether a statistical ensemble describes well a real single system. The...
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Demystifier replied to the thread Undergrad Do ensemble-based predictions truly describe real finite systems?.A canonical or grand-canonical ensemble is best understood as a small (but macroscopic) subsystem of a larger system. The larger system...