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I'd like to study a class of systems which are (essentially) coupled electromagnetic/acoustic oscillators which can act as antennas for an electromagnetic field, but also can vibrate mechanically with resonant...
Asked on 10/21/2020
1 answerCan anyone explain the principle that results in a distant object being perceived as larger when viewed from an elevated position? eg: I notice when viewing a Shipping Vessel from...
Asked on 10/21/2020
1 answerA swimmer swims with the velocity 1.25 m/s "relative to water". He has to swim across the river which is 150 meters wide. If his direction of velocity is perpendicular...
Asked on 10/21/2020 by Lauren Sin
1 answerIn some class II force fields, there are cross-terms that characterize bond-bond, bond-angle interactions and others. Example of equations below: $$sum_{bond-bond}^{}k_{bb}(b-b_{0})(b^{'}-b^{'}_{0})$$$$sum_{bond-angle}^{}k_{ba}(b-b_{0})(theta^{'}-theta^{'}_{0})$$ My question is: how do I...
Asked on 10/20/2020 by Emerson P L
0 answerConsider a complex scalar field with Lagrangian$$mathcal{L} = (partial_{mu} bar{phi})(partial^{mu} phi) - V(phi)$$with potential$$V(phi) = frac{1}{4}lambda(bar{phi}phi - eta^2)^2$$The model is invariant under global ...
Asked on 10/20/2020 by Jack Hughes
2 answerI am currently reading S. Sachdevs Book on Quantum Phase Transitions focusing on the Bose-Hubbard Model (Chapter 9) and especially the Dilute-Boson Field Theory (Chapter 16). When...
Asked on 10/20/2020 by jan0155
1 answerI just started learning quantum physics and there is a particular notion confusing me. While reading McIntyre book, he suggests I find the matrix representation of the $S_n$ operator,...
Asked on 10/20/2020 by H44S
2 answerI've heard you must aim lower relative to the target (possibly below it??) when shooting from an elevated position versus shooting from the same level as the target. How can...
Asked on 10/20/2020
1 answerIn partial-wave analysis, and particularly $s$-wave scattering, the scattering length can be defined as[lim_{krightarrow 0} kcot(delta_0)=-frac{1}{a_0}.]My question is why is it defined this way? i.e. what is the...
Asked on 10/20/2020 by Quantum spaghettification
1 answerI am always surprised by the subtleties that are embedded in the wave/particle dualism. That is why I read again and again the paragraph in the Dirac's classical text dealing...
Asked on 10/19/2020 by Matteo Lorenzini
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