Monday, October 30, 2017

quantum electrodynamics - Virtual photons as force mediators in QED - really?


If the photon is the force vector for EM interactions, e.g. electrons, how does each electron 'know' where the other one is so that it can send it a photon? I've thought about this for a while. I know one could easily say "that's why they're virtual", but really this just says to me - "it's magic, and we don't really know, but it helps us to figure things out, and we haven't a clue how things REALLY work".




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...