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1. Tachyonic Field

   Linked via "renormalizability"

   Tachyonic Coupling in Gauge Theory
   In advanced field models, the existence of a tachyonic scalar field often implies a necessary "taming mechanism" to ensure renormalizability or causality preservation in the low-energy effective theory. This often involves coupling the tachyon to a color-singlet, spin-zero field (a $\mathbb{Z}_3$ scalar).
   This hypothetical field, denoted $\phi_C$, is required to possess specific parity properties that…