Audibility of all odd blind modes in rapidly twisted polar-strip tubes
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Abstract
For a fixed connected polar section, the leading Weyl profile of a rapidly twisted Euclidean tube is independent of every odd logarithmic harmonic of inverse twisting speed. We prove that the next heat profile detects the entire odd lattice. A finite positive-root matrix lemma and two controlled aperture limits represent the full connected relative heat trace as the Laplace transform of a positive measure. An analytic mass bound and Euler-product domination then give a strict, frequency-dependent lower bound for every odd Mellin multiplier. Together with the established actual-tube heat expansion, this determines each admissible pure amplitude and every smooth admissible odd Fourier profile from the complete spectrum. A matching upper multiplier bound identifies exponential smoothing and rules out a local Hölder inverse from the lower heat profile alone, even with fixed finite-order smoothness control on the geometry. The argument is analytic.
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