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From https://en.wikipedia.org/wiki/MassAlthough inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them. [...]Suppose an...
Asked on 07/16/2021 by 1mik1
2 answerI have found two different ways of doing this and I am seeking commentary on the fine nuance. Suppose there is a Hamiltonian $$ H=frac{1}{2}int!d^3x left[ ...
Asked on 07/16/2021
4 answerI have read this Wikipedia page, but I can't understand it. In this picture from that page, in the formula, there is just one flux density, but...
Asked on 07/16/2021
1 answerHow $$[phi_1^+,:phi_2phi_3:]=:[phi_1^+,phi_2^-]phi_3:+:phi_2[phi_1^+,phi_3^-]:$$with $phi_i=phi(x_i)$ field operators ($phi_i^+$ is the annihilation part while $phi_i^-$ is the creation part), can be demonstrated? This formula seems to be used in the demonstration of...
Asked on 07/16/2021 by ketherok
1 answerI am reading magnetostatics from Introduction to ElectrodynamicsTextbook by David J. Griffiths So here ampere's circuital law in differential form was derived from biot-sarvart law and an assumption was...
Asked on 07/16/2021 by Gaurav Kochar
2 answerRecently learnt some physics, and I just want to check my understanding...
Asked on 07/16/2021 by perpetually_confused
1 answerDoes Hawking radiation assume that general relativity works perfectly, inside black holes, or on the event horizon? Could someone please tell me the exact statements made in...
Asked on 07/15/2021 by user45922
3 answerFollowing the textbook "Ideas and Methods of Supersymmetry and Supergravity" by Ioseph Buchbinder and Sergei Kuzenko (p38 - 40): If we consider the a frame deformation in our vierbein induced...
Asked on 07/15/2021 by raptakem
1 answerIn many youtube videos about building low power radio transmeters , I have seen a piece of regular wire or extension cord used as a antenna. But , it seems...
Asked on 07/15/2021
1 answerI've recently been trying to wrap my head around the notion of virtual particles, which as far as I understand live in quantum histories which can never be observed directly...
Asked on 07/15/2021 by Without a Compass
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