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In Einstein's book "Relativity" there is a wonderful derivation of the Lorentz transformation, requiring no more than high school algebra (pp. 117 - 121). It is quite clear but...
Asked on 11/25/2020 by luysii
3 answerMost of the books tend to give this explanation that for a bound physical system, the energy and momentum eigen values have discrete spectrum and otherwise, they have a continuous...
Asked on 11/25/2020
1 answerSo I have tried searching for the working of a rainbow. I found many sources and the explanation was clear. I still have a problem though. Since dispersion happens due...
Asked on 11/25/2020
2 answerI've seen this question asked a few times on Stack Exchange, but I'm still quite confused why the following "contradiction" seems to arise. By definition:$(Lambda^T)^{mu}{}_{nu} = Lambda_{nu}{}^{mu}$$Lambda^T eta...
Asked on 11/24/2020 by Shrey
5 answerThe usual way to calculate how chaotic a system is would be to measure the divergence rate using the Maximal Lyapunov exponent, but it requires you to wait until infinity,...
Asked on 11/24/2020 by bluemystic
2 answerI came across this in the lecture notes of quantum field theory by David Tong. Inside time ordering interactions aren’t...
Asked on 11/24/2020
1 answerWhat process does it describe and does it break the Conservation of Energy? For more details, Stokes's Rule is mentioned in Einstein's Proposal of the Photon Concept. ...
Asked on 11/24/2020 by Janet Michaels
0 answerConsider a rod with two equal forces acting parallel to the direction of velocity of a rolling rod, one at each end. When analysing problems involving torque, the choice of...
Asked on 11/24/2020 by Copper
1 answerForces like the electric force has a Coulombs constant $k_e$ from the Coulomb's law$$F=k_efrac{q_1q_2}{r^2}$$, which is based on the vacuum permittivity $epsilon_0$. However,...
Asked on 11/24/2020 by Jeffrey Suen
2 answerIn paper Topological Gravity as the Early Phase of Our Universe there's statement:Hamiltonian of gravitywould vanish by time reparameterization invariance.How to derive such result?...
Asked on 11/23/2020
1 answerGet help from others!
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