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The Pati-Salam model is a GUT theory which states that the gauge group is either or Special unitary group|]] and the fermions form three families, each consisting of the representations and . This includes the right handed neutrino, which is now known to exist. See neutrino oscillations. There is also a (4,1,2) and/or a scalar field called the Higgs field which acquires a VEV. This results in a spontaneous symmetry breaking from to or from to and also, , , , and . See restricted representation. Of course, calling the representations things like and (6,1,1) is purely a physicist's convention, not a mathematician's convention, where representations are either labelled by Young tableaux or Dynkin diagrams with numbers on their vertices, but still, it is standard among GUT theorists.Since the homotopy group , this model predicts monopoles. See 't Hooft-Polyakov monopole .
This model was invented by Jogesh Pati and Abdus Salam.
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