Numerical perturbation analysis shows non-topological Z' strings in the minimal 331 model remain stable only near the semilocal limit θ_S ≈ π/2 even after tuning Higgs self-couplings.
SU(3) x U(1) Gauge Theory of the Weak and Electromagnetic Interactions,
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The non-topological $Z^\prime$ string in the 331 model and its classical stability
Numerical perturbation analysis shows non-topological Z' strings in the minimal 331 model remain stable only near the semilocal limit θ_S ≈ π/2 even after tuning Higgs self-couplings.