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.
Read more about this topic: Flipped SU(5)
Famous quotes containing the words comparison and/or standard:
“Envy and jealousy are the private parts of the human soul. Perhaps the comparison can be extended.”
—Friedrich Nietzsche (1844–1900)
“Any honest examination of the national life proves how far we are from the standard of human freedom with which we began. The recovery of this standard demands of everyone who loves this country a hard look at himself, for the greatest achievments must begin somewhere, and they always begin with the person. If we are not capable of this examination, we may yet become one of the most distinguished and monumental failures in the history of nations.”
—James Baldwin (1924–1987)