There is no experimental evidence so far that could not be accommodated within the standard model. There are, however, several theoretical shortcomings which must be remedied by a more fundamental theory. The unification of forces has not really found a satisfactory formulation, since three different gauge groups U(1), SU(2), and SU(3) are used to describe the electromagnetic, weak, and strong interactions.
Gauge Group Domain Wall Gauge Boson Supergravity Theory Proton Decay
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