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According to special (& galilean) relativity, there is no difference between constant movement or not moving at all but it is possible to detect acceleration and rotation is acceleration. The...
Asked on 10/02/2021
2 answerSo I am studying classical mechanics through the MIT 8.223 notes, and encountered the derivation of the Euler Lagrange equation. There is a part I don't quite understand, which resides...
Asked on 10/02/2021
4 answerConsider the Einstein-Maxwell-dilaton theory with an additional Chern-Simons term as in this paper begin{equation}S = int d^4 sqrt{-g} left[ frac{1}{2} R - frac{1}{2} (partialvarphi)^2 -...
Asked on 10/02/2021
1 answerThe observable universe is approximately 13.7 billion years old. But yet it is 80 billion light years across. Isn't this a contradiction?...
Asked on 10/02/2021
8 answerMy question is as follows, below this I have included derivations of both effects: The derivation of Bloch Oscillations implies that in a perfect crystal we will not have net...
Asked on 10/02/2021
2 answerWhy there seems to be different conventions of QCD energy scales? Is that due to the running coupling? For example in Wikipedia https://en.wikipedia.org/wiki/Coupling_constant#QCD_scale:$$Lambda_{rm MS}...
Asked on 10/02/2021
0 answerThe Feynman's path integral representation gives the quantum amplitude to go from point $x$ to point $y$ as an integral over all paths.How is that idea consistent with...
Asked on 10/02/2021
1 answerWhich phenomena is responsible for this kind of backward curled flow of the fluid (air)? Kindly if anyone...
Asked on 10/02/2021
1 answerThis has confused me for some time: if one integrates the gravitational force between two radii (let the motion of the particle always point toward the centre of mass of...
Asked on 10/02/2021
3 answerI thought I had the conceptual understanding of how magnetism between a charged particle and a current carrying wire can be seen from the point of view of relativistic effects,...
Asked on 10/02/2021
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