Comparison With The Standard SU(5)
The name "flipped" SU(5) arose in comparison to the "standard" SU(5) model of Georgi-Glashow, in which and quark are respectively assigned to the 10 and 5 representation. In comparison with the standard SU(5), the flipped SU(5) can accomplish the spontaneous symmetry breaking using Higgs fields of dimension 10, while the standard SU(5) requires both a 5- and 45-dimensional Higgs.
The sign convention for U(1)χ varies from article/book to article.
The hypercharge Y/2 is a linear combination (sum) of the of SU(5) and χ/5.
There are also the additional fields 5-2 and containing the electroweak Higgs doublets.
Calling the representations foe example, and 240 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, and is a standard used by GUT theorists.
Since the homotopy group
this model does not predict monopoles. See Hooft-Polyakov monopole.
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