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In the framework of QFT, quantum fields are the fundamental objects instead of point-like notion of particles. Particles, at least fundamental ones like electron, are understood to arise as excitations...
Asked on 12/12/2021
2 answerPeskin and Schroeder's QFT book in equation (2.33) gives the momentum operator $bf P$ as$${bf P} = - int d^3 x pi(x) nabla phi (x) = int...
Asked on 12/12/2021
2 answerBasically, an electric charger consists of a transformer, which transfers electrical energy from one inductance to another.. َAs i imagine the process physically the first circuit...
Asked on 12/12/2021
2 answerSo, I was told in my class that Safety devices like fuses should be connected on the live wire. But isn't the conventional current opposite to the direction of the...
Asked on 12/12/2021
3 answerThe near-range magnetic field $vec{B}$ of a point charge $q$ at distance $vec{r}$, moving at a non-relativistic velocity $vec{v}$,...
Asked on 12/12/2021
0 answerI have a question concerning the quantization of phase-space variables $(q_1, q_2, q_3, p_1, p_2, p_3)$ with the Hamiltonian $$H = frac{3}{2}(p_1^2+p_2^2 +p_3^2)$$ and the following...
Asked on 12/10/2021
1 answerI am trying to understand how NMR works, but I am not sure why a spinning nucleon produces a magnetic field. Is this a consequence of the quark structure inside?...
Asked on 12/10/2021
2 answerI am now reading some articles about Dirac fermions in condensed matter physics and the most famous example is graphene. I am now trying to understand page 5 in this...
Asked on 12/10/2021
1 answerI was reading about the concept of effective mass and came across the statement that the effective mass of a particle can be negative, zero and even...
Asked on 12/10/2021
2 answerIn this picture, the movement of the coil inside an AC generator is shown. My question is when the angle is...
Asked on 12/10/2021
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