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One is speaking of models, which are validated at low energies and are evaluated at energies much higher than laboratory energies. In Grand Unification of all three forces weak, strong and electromagnetic, In the 1970's, Sheldon Glashow and Howard Georgi proposed the grand unification of the strong, weak, and electromagnetic forces at energies above ...


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I don't think this assumption is legit: Assume the you initially have two quarks (up and anti-up for instance) that are placed far outside of causal contact with each other for a real experimental setup. Indeed, what would have been the previous history of those two scorrelated (outside of each other's light cone) quarks, to be produced isolated? ...


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These are some nice answers! Wanted to add that, as you know, how strongly the quarks couple to each other (or interact with each other) is momentum-dependent. So within the nucleons (protons and neutrons) quark coupling is very strong (which is why the quarks are confined in the nucleons). Because the interquark interaction is so strong at these ...



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