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It is said that vacuum spaces contain particles and antiparticles, my question is if so whether empty space has mass/energy?...
Asked on 03/04/2021 by babu thomas
1 answerHow QED eliminates the cases whenin loop corrections two fermions get created with the same momenta and spin state?Is it done by the ladder operators? Edit: the two...
Asked on 03/04/2021
1 answerImagine a spherical planet with no atmosphere. A ball is launched radially with a velocity $v$, maintaining $frac{v_e}{sqrt2}<v<v_e $ and there is no other objects in the universe...
Asked on 03/04/2021 by Syed Emad Uddin Shubha
2 answerI am trying to follow a derivation in a paper (DOI: 10.1119/1.2710486). It defines the Lagrangian density for an ananomalous magnetic moment (Pauli moment) in the Dirac theory as, ...
Asked on 03/04/2021
0 answerI'm not a physicist but I was attempting to write a story that includes some special relativity shenanigans that I hoped someone could verify. The gist of it is that...
Asked on 03/04/2021 by Pavle Mihajlovic
1 answerGiven the following theory $$mathcal{L} = frac{1}{2}dotvarphi^2-frac{1}{2M^2}(Deltavarphi)^2-frac{m^2}{2}varphi^2-frac{g}{4!}varphi^4$$ it's easy to show that the free propagator ($g=0$) in Fourier space is given by $$G(p^0,p) = frac{i}{(p^0)^2-dfrac{|p|^2}{M^2}-m^2+iepsilon}.$$ I want...
Asked on 03/04/2021 by Davide Morgante
0 answerThe Penning trap can confine a free (I believe) Electron. The optics world has made great advancements, can we sow some doubt on the Heisenberg principle by nailing down the...
Asked on 03/04/2021 by tombnyg
1 answerIf we have the wavefunctional $Phi[psi]$ which tells us the probability density for finding $psi$. Let's say we know the exact field state at $t=0;$ $psi(x,0)$....
Asked on 03/04/2021
1 answerI have been given an equation, without an explanation on the constant included. The equation is the following: $$Gamma= frac{7pi}{24} G^2_{text{Fermi}}$$ When looking for a value for the Fermi...
Asked on 03/04/2021
1 answerI know the written derivation of $v=rω$, we just differentiate $∆s$ and $r∆theta$ but can someone please provide an intuitive derivation....
Asked on 03/04/2021 by Ayush Bora
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