IV.P174 — Polarity-switching requires balanced polarity

If pol(X) > 0 the polarity-switching amplitude is exponentially suppressed by exp(-pol(X)/iota_tau) from the spectral gap between chi_+ and chi_- eigenvalues; for pol(A) = 0 alone, the gap vanishes and the off-diagonal amplitude is set by the sector coupling, enabling unsuppressed transitions.