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Pair production is the creation of an elementary particle and its antiparticle out of a neutral boson, typically a photon, but sometimes a gluon.

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Pair production in vacuum

Whatever is the reference frame, one needs the energy of at least $2mc^2$ to create a pair. Moreover, the momentum conservation requires that the momenta of the electron and the positron sum up to zer …
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15 votes

On the (non)linearity of electromagnetism

Maxwell equations are linear... but they are also incomplete - they involve sources (i.e., currents and charges) that cannot be determined from these equations. To really solve Maxwell equations these …
Roger V.'s user avatar
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