Timescale coalescence in AR(1) hidden drivers creates a spectrally dark regime where persistent forcing is invisible to one-pole models, with the local spectral distance scaling as C lambda^4 due to manifold geometry.
Whittle, The analysis of multiple stationary time se- ries, Journal of the Royal Statistical Society: Series B 15, 125 (1953)
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Timescale Coalescence Makes Hidden Persistent Forcing Spectrally Dark
Timescale coalescence in AR(1) hidden drivers creates a spectrally dark regime where persistent forcing is invisible to one-pole models, with the local spectral distance scaling as C lambda^4 due to manifold geometry.