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I'm arguing with a friend of mine on whether the light emitted from the sun is of the same type of that emitted by a bulb. Her insistent ignorance is...
Asked on 07/29/2021
7 answerI have learned about the commutators, and read this: $$[A, f(B)] = f'[A,B]+frac{1}{2}f''([A,B]B+B[A,B])+frac{1}{3!}f'''([A,B]B^2+B[A,B]+B^2[A,B])+...$$ then Simplified to $$[A, f(B)] = [A,B](f'+f''B+frac{1}{2}f'''B^2+...)=[A,B]frac{df}{dB}$$ I do understand the first two equations, only...
Asked on 07/29/2021 by tinghaoliu
1 answerI just wanted to ask what the correct formula for the Magnetic Field around a single moving point charge is. In most places I have seen it written as ...
Asked on 07/29/2021 by Sanskar Jain
2 answerAccording to General Relativity, any heavy object can curve spacetime significantly. But then black holes, which have the mass of a star, have much higher gravitational forces. So can we...
Asked on 07/28/2021 by V .Kiran Bharadwaj
1 answerI realise this is a (slightly) nihilistic question but lock down and all... Is it possible to destroy the solar system by launching a proton at the sun at a...
Asked on 07/28/2021 by user106271
1 answerThe Maxwell's fourth equation is $$ vecnabla times vec H = vec J_c + vec J_d spacespace$$ $$ text{where} spacespace vec J_d =...
Asked on 07/28/2021 by user207787
0 answerI asked this question on electrical engineering stack exchange but I didn't get any reasonable answer ,so I think this question is better suited here. I was try to figure...
Asked on 07/28/2021
2 answerUsing the von Neumann entropy definition, the pure states have zero entropy and we have the full information about the system. My understanding is that the whole universe should be...
Asked on 07/28/2021
0 answerSo, I'm dealing with the smart antenna and different DoA algorithms. In order to define narrowband signal directions I have to calculate autocorrelation matrix of this antenna in the frequency...
Asked on 07/28/2021 by user577674
0 answerI am trying to understand the time-like T-duality rules in Type II effective actions, and how they relate D-branes to E-branes.In the case of the metric and dilaton, the...
Asked on 07/28/2021 by TeaDuality
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