EMBEDDED DEFECTS AND SYMMETRY BREAKING IN FLIPPED $SU(5)$

Details EMBEDDED DEFECTS AND SYMMETRY BREAKING IN FLIPPED $SU(5)$ EMBEDDED DEFECTS AND SYMMETRY BREAKING IN FLIPPED $SU(5)$

1995-04-27

arxiv.org/abs/hep-ph/9504411v1

Phys.Rev.D52:7265-7275,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, LATEX

Scientific paper

10.1103/PhysRevD.52.7265

We explicitly show the analogy between the symmetry breaking scheme for the GUT flipped $SU(5)$ with that of the Weinberg-Salam theory of electroweak interactions. This allows us to construct the embedded defect spectrum of the theory flipped $SU(5)$. We find that the spectrum consists of twelve gauge-equivalent unstable Lepto-quark strings, which are analogous to W-strings in electroweak theory, and another string that is gauge inequivalent to the Lepto-quark strings, which we call the `V-string'. The V-string is analogous to the Z-string of electroweak theory, correspondingly admitting a stable semilocal limit. Using data on the running coupling constants we indicate that in the non-supersymmetric case V-strings can be stable for part of the physically-viable parameter space. Cosmological consequences are briefly discussed.

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