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I am currently reading Niklas Beisert's lecture notes on QFT, Chapter 10, on the scattering matrix $S$.$^1$ My main confusion lies in the construction of...
Asked on 10/29/2021
2 answerCold or slow neutrinos have non-relativistic velocities and hence very low energies. That makes them very difficult to detect. Answers to Where are all the slow neutrinos? make it...
Asked on 10/29/2021
2 answerI was reading some notes by John Chalker on order by disorder and encountered a classical spins partition function calculation. I could not follow the integration, i.e. obtaining eqn. (1.7)...
Asked on 10/29/2021
1 answerWill magnets lose strength over time when coupled to another magnet ? Im designing a part (c. 200g) which needs to be held in place, but also be removable, so...
Asked on 10/29/2021
3 answerThe nuclear force spin dependence term of deuterium is easy to explain, its was explained before in this site in question 288357. But what about larger nuclei with higher...
Asked on 10/29/2021
0 answerThe principle of least action says that a body moves in such a way that the action value $S=int L dt$ is stationary (often minimal). The...
Asked on 10/29/2021
1 answerThe presence of the unmodified line (wavelength) in the scattered X-ray beam, in a Compton scattering experiment, is called the Rayleigh line. This line originates from the Compton scattering of...
Asked on 10/29/2021 by Solidification
1 answerSuppose that I am going to host a big party one month from now, and I have various liters of cold beverages that will need to be refrigerated by the...
Asked on 10/29/2021
4 answerGenerally in text books they say that when a electron goes from high energy state to a lower energy state it emits photons.My question is, it is possible that...
Asked on 10/29/2021
7 answerI have searched everywhere I know to look but I cannot find out how Hamilton's equations deal with non-conservative forces. In my understanding, Lagrangian mechanics deals with this as follows:...
Asked on 10/29/2021
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