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Not electric spark or electric arc, just normal current through gases created by heating the air between cathode and anode as shown in the following video at 1:25. ...
Asked on 12/18/2020 by Fizzics
1 answerI'm trying to understand charge renormalization in QED. I know that one can write the full photon propagator as $$frac{-ieta_{munu}}{q^2(1-Pi(q^2))}$$ where $Pi$ is regular at $0$. Obviously this leads to...
Asked on 12/18/2020 by Edward Hughes
1 answerAccording to Kinetic theory of matter: "All matter is made up of atoms and molecules that are constantly moving". But why? What is the deep explanation for the movement (translate,...
Asked on 12/18/2020 by John T
0 answerI'm trying to transform the kinetic energy Hamiltonian to momentum basis. Starting with:$$hat{T} = -frac{hbar^2}{2m}int d^3r hat{Psi}^{dagger}(vec{r}) nabla^2 hat{Psi}(vec{r})$$I can expand the field operators in terms of...
Asked on 12/18/2020
1 answerIdeal equations for motion of a charged particle in a Penning Trap are: $$ x(t) = rho_{+}cos(omega_{+}t + phi_{+}) + rho_{-}cos(omega_{-}t + phi_{-}) $$$$ y(t) =...
Asked on 12/18/2020 by Srilakshmidaran P
0 answerI was wondering how many times larger is the magnetic moment of an electron compared to a proton? How come the electrons magnetic moment play no role in NMR and...
Asked on 12/18/2020
1 answerI would like to write Schrödinger equation in polar coordinates in momentum representation (because I have a potential depending only on distance) . Would momentum operator be still just a...
Asked on 12/18/2020 by Nikita Koritskiy
1 answerIf there are $n$ independent coordinates for a system of particles, but all of them are functions of time, is it correct to say that the degree of freedom...
Asked on 12/18/2020 by user92155
2 answerHow do you find the quadrature variance of a state $$lvert xrangle =lvert a,brangle +lvert a,-brangle$$ where $lvert a,brangle = D(a) S(b) lvert 0rangle$? $lvert xrangle$...
Asked on 12/18/2020 by Aravind Hari
1 answerI've been reading this book, in which the author expresses the vacuum projection operator $vert 0ranglelangle 0vert$ in terms of the number operator $hat{N}=hat{a}^{dagger}hat{a}$, where...
Asked on 12/18/2020
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