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 flipped SU(5) theory. We find that the spectrum consists of twelve gauge-equivalent unstable leptoquark strings, which are analogous to W strings in electroweak theory, and another string that is gauge inequivalent to the leptoquark 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 nonsupersymmetric case V strings can be stable for part of the physically viable parameter space. Cosmological consequences are briefly discussed. © 1995 The American Physical Society.
- Received 17 May 1995
©1995 American Physical Society