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There is something that does not make sense to me regarding a derivation that I am reading of the Planck distribution for black body radiation emitted from a cavity. It...
Asked on 01/30/2021 by Rory Cornish
1 answerI have a problem involving the new chaotic system dubbed as the Chen System. This involves a system of coupled nonlinear ordinary differential equations. My problem is to determine for...
Asked on 01/30/2021 by Lawrence Calixto
0 answerWe have a Harmonic Oscillator in the Thermal state $tau(beta)$ which is defined $$tau(beta) = frac{e^{-beta H}}{mathrm{Tr}(e^{-beta H})}$$ where $Z = mathrm{Tr}(e^{-beta H})$ is known as the...
Asked on 01/30/2021
1 answerI remember back in the day, I took a course in cosmology where I was taught that there are three possible types of universes based on their curvature, the flat...
Asked on 01/30/2021 by Kt hamil
1 answerI know the intuitive explanation of the stress-energy tensor and I have seen equations for stress-energy according to a specific situation, but I have not seen a...
Asked on 01/30/2021
3 answerAfter reading If a jet engine is bolted to the equator, does the Earth speed up? I came to think of solar sails. If an angled mirror is bolted...
Asked on 01/30/2021 by Ole Tange
2 answerFrom what I understand, energy is defined as the ability to do work. What does this actually mean and how is it different from work itself? Also, according to my...
Asked on 01/30/2021 by Matthew Tchouikine
1 answerHelium-4 has a normal-superfluid phase transition which corresponds to the lambda line in the P-T diagram. The heat capacity at constant pressure $C_p$ shows a discontinuity when the lambda...
Asked on 01/30/2021 by tepsilon
0 answerI am studying experimental methods for detecting neutrons. Having recently studied QFT, I wondered if there was a way to describe this type of process through a Feynman diagram. For...
Asked on 01/30/2021 by Alex.L
0 answerI am reading "A short course on topological insulators" https://arxiv.org/abs/1509.02295. There is a basic point that I don't understand about conduction and the band structure. Unfortunately,...
Asked on 01/30/2021 by user502918
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