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In the context of special relativity, it is well known that 4-vectors are covariant under Lorentz transformations (which is a linear transformation in space-time), however are they covariant under general...
Asked on 02/14/2021
0 answerSay you have some $textbf{B}$ field from an alternating current, $textbf B(t) = textbf{B}_0cos{omega ,t}$. And using Faraday law, e.m.f. $varepsilon$ = turns of a coil ...
Asked on 02/14/2021 by Chris Bolig
2 answerFor simplest operator $textit{M}$, I could write it as $|kranglelangle m|$.begin{equation}mathit{M} = |kranglelangle m|end{equation}When operating on a state $|nrangle$, I could write...
Asked on 02/14/2021 by Simon219
3 answerAs a simple example, take a constant magnetic field $vec{B} = (0,0,B)$. This is invariant under rotations about the $z$ axis. However, we can express $vec{B}$ as...
Asked on 02/14/2021 by DavidH
2 answerIn a recent paper https://arxiv.org/abs/2007.00082, two authors propose a new model (RMOND) which seems succesful to explain many cosmological data. Obviously, the GR theory must have as...
Asked on 02/14/2021 by Riccardo.Alestra
1 answerI've been working on the Toric Code Model (by Kitaev in his 2003 paper on quantum computation), and the model is a lattice realisation of a topological phase. The local...
Asked on 02/14/2021 by pyroscepter
0 answerI always thought it's because, if we consider a circuit ABCDE with only a battery and an ammeter, if we connect the negative terminal to the positive terminal the sum...
Asked on 02/14/2021
1 answerThe ProblemLet's start with the formula in Wikipedia: I compute: $I leqslant 4.6times10^7 bits/eV...
Asked on 02/14/2021
2 answerThis $odot$ notation is e.g. used in this Phys.SE posts:General relativity: Why don't these two differentials commute?Why isn't there a second baryon octet?...
Asked on 02/14/2021
1 answerDid the Big Bang happen at a point? goes through the fact that the Big Bang happened everywhere at the same time. John Rennie's answer explains this as being...
Asked on 02/14/2021
2 answerGet help from others!
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