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I recently participated in a classical experiment that can calculate the maximum energy of a beta radiation emission (for Tl-204). When I searched the internet for other results for comparison,...
Asked on 11/26/2020 by Frogfire
2 answerReading quantum field theory text, I am confused on regard to whether perturbation (or interaction equivalently) hamiltonian added to free-field hamiltonian is time-dependent or not. In Heisenberg picture, hamiltonian is...
Asked on 11/26/2020 by Gonzu Gonzu
1 answerLet's assume that the experiment is done in a vacuum and there's a circuit as in the attachment. The values of voltage/resistance/capacitance are insignificant. Assume that the right terminals of...
Asked on 11/26/2020 by Robert Gawron
2 answerSuppose $mathbb{U}$ is a unitary operator acting on the Hilbert space of states representing a symmetry transformation such as rotation, translation, etc. $mathbb{U}$ is said to be a...
Asked on 11/26/2020
2 answerTopology has many occurences in physics like topological insulators, topological quantum computing etc. But what is confusing me is that topology is this mathematical theory that studies the behaviour of...
Asked on 11/26/2020 by AccidentalTaylorExpansion
0 answerGiven the quantum Heisenberg model with Hamiltonian $hat{H}=-frac{1}{2}sum_{i,j}J_{ij}hat{textbf{S}}_{i}cdothat{textbf{S}}_{j}$, the uniform mean-field approximation $hat{textbf{S}}_{i}=langlehat{textbf{S}}rangle+(hat{textbf{S}}_{i}-langlehat{textbf{S}}rangle)$ allows to rewrite it as $hat{H}_{MF}=sum_{i}textbf{B}_{eff}cdothat{textbf{S}}_{i}+text{const.}$, in order to perform a diagonalization by means...
Asked on 11/26/2020 by Milarepa
1 answerI recently watched Veritasium's (excellent) video "Misconceptions about the Universe". However, he said something (at 2min 25s) which I think is wrong. Can somebody please clarify this one way or...
Asked on 11/26/2020 by Big AL
5 answerIn relativistic fluid dynamics I encountered a way of writing $partial_mu $ as follows:$partial_mu = mu_mu D + nabla_mu $. Here $mu_mu $ is the four-velocity. $D=mu^alpha partial_alpha=(partial_t,mathbf 0...
Asked on 11/26/2020 by Icchyamoy
1 answerPerpetual motion machines don't work because as it moves, the air molecules hit it and slow it down. Friction slows it down in a similar way. If...
Asked on 11/26/2020 by Rachel Tuckman
3 answerThis is a pretty basic question but I would just like some confirmation of what I suspect is true. As I understand it, the basic idea behind x-ray crystallography...
Asked on 11/26/2020 by spinodal
1 answerGet help from others!
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