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Suppose I have a Lagrangian $mathcal{L} = mathcal{L}(phi, partial_mu phi)$ for a (let's say) real scalar field with no explicit temporal or spatial dependence. Then I believe the usual...
Asked on 12/21/2020
0 answerI do not understand what the first and the second fluctuation- dissipation theorems physically represent and what are the differences between the first and the second on the physical side....
Asked on 12/21/2020 by Hub One
0 answerWhile working on a completely unrelated quantum computing problem, I ran into a quantity that can be mapped to a partition function of spins on a triangular lattice. It is...
Asked on 12/21/2020 by Angelo Brillante Romeo
1 answerI have tried for a while finding an answer to this question. Similar ones have been explained earlier by using Gauss law. However I am wondering about the physical change...
Asked on 12/21/2020 by Gjert
2 answerI'm having an issue understanding why $hat{P}_x$ commutes with the Hamiltonian in the Landau gauge ($A_x=-Bhat{Y}, A_y=0$) in two dimensions. I've been finding elsewhere online the hand-wavey argument...
Asked on 12/21/2020 by Ethan Mullen
0 answerI have learned about the Ricci tensor and I was wondering if it actually changes volume in real-life physics.The question I know the Ricci tensor is a mathematical object...
Asked on 12/21/2020 by Tachyon
3 answerHere's the textbook question: Twelve wires of equal length 'l' are connected to form a skeleton cube which moves with constant velocity v perpendicular to the magnetic field B. What...
Asked on 12/21/2020 by Swami
3 answerHow are the two different? I know that CC has negative pressure and opposes gravity. But what about VED? Is VED supposed to have positive pressure and cause gravity too?...
Asked on 12/21/2020
0 answerIn Fluctuation-induced current from freestanding graphene (peer-reviewed version on Phys. Rev. E, note: behind a paywall) Thiabado, et al, report the extraction of work...
Asked on 12/21/2020 by James Bowery
2 answerSuppose I lift a weight of 1kg through 1metre, say from the floor to my waist height. The Potential Energy or work done against gravity is: PE=mgh= 1kg x 9.81m/s^2...
Asked on 12/21/2020 by Ludo
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