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I was wondering if anyone knew of a reference which treat time-independent perturbation theory in a mathematical fashion. All of the mathematical textbooks in quantum mechanics that...
Asked on 12/01/2020 by Iván Mauricio Burbano
0 answerI have to find the order of 1/ε poles in dimensional regularization of $dfrac{lambda}{4!}phi^4$ theory. The Feynman integral is the...
Asked on 12/01/2020
0 answerIn page 249 of Kleppner and Kolenkow, An introduction of Classical Mechanics, for the proof of Parallel axis theorem, he writes the vector connecting the axis(z-axis) to mass element is...
Asked on 12/01/2020
1 answerSuppose Alice and Bob each hold qubits; they have a joint state $$|psirangle = frac{1}{sqrt 3}big(|00rangle + |01rangle + |11ranglebig).$$ Alice measures the first qubit in some basis (say...
Asked on 12/01/2020
1 answerI have to derive a formula for the symmetry factor of the diagrams of the form in $phi^4$-theory, where...
Asked on 11/30/2020
2 answerI have a volume element in phase space: $$ domega = prod _{i=1}^{N}(dq_{i},dp_{i})$$ Now I should show the invariance of this product under canonical transformations. I think first I would...
Asked on 11/30/2020 by zodiac
1 answerPotential is defined as ${phi,, 0,, A,, 0 }$; fields are static and depend only on the axial coordinate $x$: $E_x=-partial_xphi$, $B_z=partial_x A$. Charged particle moves...
Asked on 11/30/2020 by Timofey Chernyshev
0 answerQuantum geometrodynamical WdW equation is given by: $hat{H}psi=(frac{1}{2sqrt{h}}G_{abcd}hat{Pi}^{ab}hat{Pi}^{cd} -sqrt{h}hat{R}^{(3)})psi=0$ for generic ADM splitted metric:$ds^2=-N^2dt^2+h_{ab}(dx^a+N^adt)(dx^b+N^bdt)$. With mommentum operator:$hat{Pi}^{ab}=-ifrac{delta}{delta h_{ab}}.$ Lets consider FLRW spacetime:...
Asked on 11/30/2020 by StarPlatinumZaWardo
0 answerIt can be sai!d that antimatter and matter are opposite excitations in an all permeable quantum field. excitations can be said as waves. so, matter and antimatter can be interpreted...
Asked on 11/30/2020 by Tac Genis
1 answerHow to prove Bloch function is periodic in reciprocal lattice? I saw in some textbooks this formula:$$ Psi_{mathbf{k}} (mathbf{r}) = sum_{mathbf{G}} c_{mathbf{k}+mathbf{G}}e^{i(mathbf{k}+mathbf{G})cdot mathbf{r}}$$which makes...
Asked on 11/30/2020
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