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This post claims that there is no real photon (particle) with a plane wave solution well-defined momentum state). It makes sense somehow to me. I can think of several...
Asked on 12/29/2021
2 answerIt is commonly known that the eigenstates to the Hamiltonian of a constant potential are plane waves, aka $$V(r) = V_0 Rightarrow Hpsi = n text{ with }...
Asked on 12/29/2021
2 answerEinstein and others have thought about VSL theories. But I am unable to understand how VSL theories can be consistent, for the following reasons: Don't we need some mechanism (like...
Asked on 12/28/2021
0 answerI'm not sure whether this is the correct community to post this, so pardon me. I was studying the Bicycle Kinematic Model and came across 3 possible reference points for...
Asked on 12/28/2021
2 answerI just found a paper "On a common misunderstanding of the Birkhoff theorem". This means that inside a spherically symmetric thin shell there is no gravitational force,...
Asked on 12/28/2021
1 answerI am quoting from "Equilibrium and non-Equilibrium Statistical Thermodynamics", by M. Bellac.$$Q_{(alpha, beta)} = sum_{N=0}^{infty} e^{alpha N} Z_{N}(alpha, beta) hspace{1cm} (3.127)$$Where $Q$ is the grand partition...
Asked on 12/28/2021
0 answerAs far as I can tell temperature seems to be defined as something like average kinetic energy per molecule, but not quite. It looks like it measures something proportional to...
Asked on 12/28/2021
2 answerSummary: at relativistic speeds, if you compute a planet's relative distance using angular diameter (roughly proportional to 1/angular diameter), will that computed distance increase or decrease linearly, assuming you are...
Asked on 12/26/2021
2 answerWhen people talk about topological order and Majorana fermions in a BCS superfluid, do they admit the existence of a massless Goldstone mode? (As I've heard that soft Goldstone mode...
Asked on 12/26/2021
1 answerMy confusion is about the different Hilbert spaces we meet in QFT. In a first introduction to QFT, the Hilbert space is often taken to consist of wavefunctionals on classical...
Asked on 12/26/2021
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