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I was following Schwarz's book on quantum field theory. There he defines the asymptotic momentum eigenstates $|irangleequiv |k_1 k_2rangle$ and $|frangleequiv |k_3 k_4rangle$ in the S-matrix element ...
Asked on 02/01/2021
2 answerNewton's second law of motion states that $F = ma$, where $F$ is the net force on some object with mass $m$ and acceleration $a$. This...
Asked on 01/31/2021
6 answerQuestion referring to this questionTransition Amplitude in Free Field Theory The previous person shows an example with a two particle to one, what would happen if we were...
Asked on 01/31/2021 by milkcookie
1 answerIt is well known that the Klein-Gordon equation have a kind of "square root" version : the Dirac equation. The Maxwell equations can also be formulated in a Dirac...
Asked on 01/31/2021
2 answerI'm trying to make sense of the following generalized expression from Wikipedia page on partition function: $$langle (Delta X)^2rangle=frac{partial langle Xrangle}{partial beta Y}=frac{partial^2 ln Z}{partial...
Asked on 01/31/2021 by user101043
2 answerI've read that nuclear fusion is what generates such large quantities of solar neutrinos. Also saw that it was recently experimentally confirmed that two types/energies of neutrinos are generated in...
Asked on 01/31/2021 by Brad Cooper - Purpose Nation
2 answerI learned that X-ray diffraction happens due to the periodic arrangement of atoms in a crystalline material, so can X-ray diffraction studies be done on liquids and non-crystalline materials ?...
Asked on 01/31/2021 by theenigma017
2 answerPlease tell me if I'm wrong with an explanation (A Level explanation please). You feel the heaviest at the bottom of the ferris wheel because in order for there to...
Asked on 01/31/2021
3 answerHello, I don't quite see why should the angle between $hat{dot{theta}}$ and the projection of $hat{dot{phi}}$ onto the...
Asked on 01/31/2021
1 answerIn this stack about deriving Lorentz transformations, the op writes an answer where he proves the relation between time in a moving frame and regular frame but I...
Asked on 01/31/2021
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