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

Abstract

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.

21 pages, LATEX

References in corpus (9)

• Uncertainties in Coupling Constant Unification
• The Search for a realistic flipped SU(5) string model
• Decay of Metastable Topological Defects
• Embedded Defects
• Cosmic Strings and Electroweak Baryogenesis
• Semilocal Defects
• Formation of Topological Defects at First Order Phase Transitions
• The Simplest, String-Derivable, Supergravity Model and its Experimental Predictions
• Stability of Two Doublet Electroweak Strings

Cited by in corpus (8)

• Semilocal and Electroweak Strings
• Natural Magnetogenesis from Inflation
• Upper Bound on the Tensor-to-Scalar Ratio in GUT-Scale Supersymmetric Hybrid Inflation
• Constraining Supersymmetric SO(10) Models Through Cosmology
• SU(8) family unification with boson-fermion balance
• Dissipating Cosmic Vortons and Baryogenesis
• Microphysics of SO(10) Cosmic Strings
• Examples of Embedded Defects (in Particle Physics and Condensed Matter)