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B Why SU(3)xSU(2)xU(1)?

  1. Jan 31, 2017 #51
    After that amount of time? It would be early in the Universe's history. Extrapolation of the Standard Model's coupling constants with increasing interaction energy reveals that they meet at around 2*1016 GeV.

    But the overall principle is correct, I think, and a variety of higher-symmetry Grand Unified Theories have been proposed.
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