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I was wondering if it was possible, by using only lenses, mirrors, or prisms, to rotate a ray of light coming from a certain direction. For example, if I have...
Asked on 02/24/2021 by Ermir
3 answer$$hat{H}_{mathrm{BCS}}=sum_{k sigma} varepsilon_{k} c_{k sigma}^{dagger} c_{k sigma}-sum_{k k^{prime}} G_{k k^{prime}} c_{k uparrow}^{dagger} c_{-k downarrow}^{dagger} c_{-k^{prime} downarrow} c_{k^{prime} uparrow} $$ Any books on how to derive it? I...
Asked on 02/24/2021 by user220348
1 answerIn vertical farms you need to use LEDs to make plants grow, which in turn have to be powered e.g. by solar panels. If solar panels had the same efficiency...
Asked on 02/24/2021 by Felix B.
1 answerCould someone please explain to me why we can easily neglect the displacement current when we consider a plasma in astrophysics? Thank you...
Asked on 02/23/2021 by Jokerp
1 answerLet's denote the tangential and the normal accelerations by $a_t$ and $a_n$, respectively. Then, what angle does $$tan alpha = frac{|a_t|}{a_n}$$stand for? If it was just...
Asked on 02/23/2021 by VIVID
0 answerLet I be the current flowing across some junction as a result of N charge carriers of charge q. And let $langle I (t) rangle$ be its average. Assume...
Asked on 02/23/2021
1 answerI am currently working through Wald's GR book and in the chapter about causal structure, he defines a future directed causal/timelike curve to be differentiable. Now in his remark after...
Asked on 02/23/2021 by DerHutmacher
1 answerClearly I'm not an expert of QM but recently I came across the fact that particles do not have intrinsically a specific location until they interact (very ambigous term to...
Asked on 02/23/2021 by strategaD
3 answerI've been working on a problem for my classical mechanics 2 course and I am stuck on a little math problem. Basically, I am trying to prove this equation of...
Asked on 02/23/2021 by maxxslatt
3 answerSay we have a gauge-fixed QED Lagrangian: $$mathcal{L} = - frac{1}{4}{F}_{munu}F^{munu}+ frac{1}{2a}left(partial_mu A^muright)^2+barpsi_1(igamma^mu D_mu - m_1)psi_1.$$ My question is how can we check the gauge invariance of loop...
Asked on 02/23/2021 by Pinkman98
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