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Thanks for the video, it's interesting, and a lot better than a lot of the garbage that gets posted here!
Originally posted by Gorman91
Virtual particles are most interesting, considering they generate in a vacuum. It is essentially proof of something phasing in and out of the universe.
Virtual particles are a language invented by physicists in order to talk about processes in terms of the Feynman diagrams. These diagrams are a shorthand for a calculation that gives the probability of the process. The calculation is derived from quantum field theory.
Particle physicists talk about these processes as if the particles exchanged in the intermediate stages of a diagram are actually there, but they are really only part of a quantum probability calculation. It is meaningless to argue whether they are or are not there, as they cannot be observed. Any attempt to observe them changes the outcome of the process.