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As far as I know, a charged plate capacitor produces an electric field between the plates but outside the plates, the...
Asked on 08/08/2021
1 answerI have two very general questions about operators in quantum mechanics. Suppose $A$ and $B$ are self-adjoint operators associated to conjugate physical quantities (e.g. position/momentum), meaning that ...
Asked on 08/08/2021
0 answerI am following MIT lessons on quantum physics (Prof. Zwiebach): Part I, Lecture 6, at https://ocw.mit.edu/courses/physics/8-04-quantum-physics-i-spring-2016/lecture-notes/ Video lecture: https://youtu.be/Ex_fFlwZoM0 I understand that the normalized...
Asked on 08/08/2021 by franchino
1 answerWell, one of the "mantras" of General Relativity is:Einstein Field Equations concerns about the local geometrical structure of spacetime (the metric tensor) and tell you nothing about the fixed undelying...
Asked on 08/08/2021
1 answerIn the paper https://projecteuclid.org/euclid.cmp/1103922050, the equation 5.4 seems to be lacking a minus:$$left(dfrac{m_B}{m_P}right)^8dfrac{1}{m_B}sim 10^{122}yrs$$seems to be OK only if $n=-8$ (anyway, I am...
Asked on 08/08/2021
1 answerIn A First Course in General Relativity, Schutz asks the reader to prove that $nabla vec{V}$ is a $(1,1)$-tensor, where $$(nablavec{V})^alpha_{ beta} equiv V^alpha_{ ...
Asked on 08/08/2021 by Doubt
1 answerI am reading a book about astrophysical fluid dynamics, some basic fluid equations are mentioned, but is there any difference between astrophysics case and general case? Is...
Asked on 08/08/2021
1 answerFrom the principle of conservation of energy, for each electron: Electrical potential energy = Kinetic energy $$eV = frac{mv^2}{2}$$ $$v = sqrtfrac{2eV}{m}$$ where e is the charge of...
Asked on 08/08/2021 by Saitm
2 answerI have been reading Sakurai's Modern Quantum Mechanics and I am confused by this: A translation operator $mathscr T(delta x)$ is defined as $mathscr T(delta x) |x rangle...
Asked on 08/08/2021
1 answerIn this video, the following is said between 06:07 to 06:38:Now one of the interesting questions is how do you get from thequantum of space and...
Asked on 08/08/2021
2 answerGet help from others!
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