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I'm working on a project which uses cylindrical permanent magnets, and I'm trying to determine the expected magnetic field due to these magnets. One problem I run into is that...
Asked on 12/07/2020 by Daniel H.
0 answerIn standard textbooks in QFT while discussing e.g. the Kallen-Lehmann formula (see e.g. Section 7.1 in the Peskin-Schroeder book) it is always assumed that bound states of two or more...
Asked on 12/07/2020
1 answerWe have water flowing in an open channel. A small tube is placed in the channel, and the water raises to a height "l" above the water surface. The distance...
Asked on 12/07/2020 by Jmei
1 answerWhen using a conductive (metal) mesh, effectively a metallic woven fabric, in vacuum applications as a "grid" for charged particle optics, how does one calculate (or at least estimate) the...
Asked on 12/07/2020 by iwantmyphd
1 answerThe notion of "integrability" is everywhere in physics these days. It's a hot topic in high energy theory, atomic physics, and condensed matter. I hear the word at least once...
Asked on 12/07/2020 by knzhou
3 answerI’m studying QFT and confused about the difference between $D^{(s_{+},s_{-})}(Lambda)$ and $D^{(s_{-},s_{+})}(Lambda)$. For example, when we make the vector representation, we don’t take $D^{(frac{3}{2},0)}(Lambda)$ but $D^{(frac{1}{2},frac{1}{2})}(Lambda)$....
Asked on 12/07/2020 by Siam
0 answerIn special relativity the energy of a material point is defined$$E= frac{m_0}{sqrt{1-v^2/c^2}}c^2,$$and the momentum is defined by$$mathbb{p}= frac{m_0}{sqrt{1-v^2/c^2}}mathbb{v},$$where $mathbb{v}$ is the velocity...
Asked on 12/07/2020
0 answerWhen I plot the van der Waals equation of state in terms of Pressure (bar) versus density (mol/L) for propane at 400 K, $$P=frac{RT}{big(V_m-bbig)}-frac{a}{V_m^2}$$ in terms of...
Asked on 12/06/2020 by Elliott Reeves
1 answerI'm having a hard time understanding a few things about L-S and j-j coupling in 2 (or more) electron atoms. What I picked up from our lectures is the following:...
Asked on 12/06/2020 by 1MegaMan1
1 answerIm having some confusion regarding the gravitational field equations we can get from a certain action. If Im given an action and they ask me to obtain the gravitational field...
Asked on 12/06/2020
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