Sunday, March 4, 2018

conservation laws - Why are there e.m. vacuüm fluctuations?


According to the rules of qft there are virtual photons in the vacuüm. But how can this be if for the production of photons you need an electric charge?




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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 \...