Global Internal Symmetry
Z2 (matter parity) not related to U(1)R in any way for this particular model
Read more about this topic: Flipped SU(5)
Famous quotes containing the words global, internal and/or symmetry:
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—Guy Debord (b. 1931)
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“What makes a regiment of soldiers a more noble object of view than the same mass of mob? Their arms, their dresses, their banners, and the art and artificial symmetry of their position and movements.”
—George Gordon Noel Byron (1788–1824)