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In Lagrangian Mechanics, we usually use generalized coordinates $q_i$ instead of the usual Cartesian coordinates $x_i$. Is there a systematic way to identify what the generalized coordinates are...
Asked on 08/07/2021
2 answerAs a rocket expels burned fuel the location of the center of the mass of the rocket (in a frame attached to the rocket) changes. Must one take this into...
Asked on 08/07/2021 by Niruddesh Jatra
1 answerI have been reading about raising and lowering operators, but I am a bit unsure of one thing. If you have a string of raising and lowering operators (or any...
Asked on 08/06/2021
2 answerI recently learned about the term "specific gravity" and was surprised to see nothing in the definition that relates to gravity, or indeed, any sort of force. I'm sure there's...
Asked on 08/06/2021 by spacediver
2 answerI saw this post about proving the ICAOR and this post proving the existence of it but I don't get the construction of ICAOR geometrically as shown in...
Asked on 08/06/2021
1 answerI guess the question is general enough but for what it's worth I am thinking on QCD while I type this. The operator product expansion is a short distance expansion...
Asked on 08/06/2021 by poisoned tea
0 answerMy understanding is that to obtain a finite vacuum energy density prediction from QFT, one must choose a cut-off point for the maximum allowed energy of a photon. Two seemingly...
Asked on 08/06/2021 by Kwarrtz
1 answerI'm really rusty on LT and hope to get some clarification. How would the Lorentz transformation of the following quantity turn out? $$Lambda_mu{}^nu int d^3k a^dagger(k)a(k)$$...
Asked on 08/06/2021
1 answerIn Exercise 9.5 of String theory text by Becker, Becker and Schwartz, the holomorphic indices are used where$gamma_7 =(1-gamma_1)(1-gamma_{bar 1})(1-gamma_2)(1-gamma_{bar 2})(1-gamma_3)(1-gamma_{bar 3})$. The above ...
Asked on 08/06/2021
0 answerWe know, As per Doppler effect, if an object travels with speed close to that of light, if appears red if it goes away from observer and it appears blue...
Asked on 08/06/2021 by full of doubts
2 answerGet help from others!
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