Absence of pure point spectrum under dynamical avoidance

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Let d∞d_\infty and NN be the parameters in the spectral construction, let ϕ\phi be the associated map, let gg be the associated rational map, and let IgnI_{g^n} denote the indeterminacy points of gng^n. For every real λ\lambda, assume there are open subsets U⊂CU\subset\mathbb C and V⊂LGV\subset\mathbb L^G such that

λ∈U,⋃n=1∞Ign⊂V,gn(ϕ(U))∩V=∅.\lambda\in U,\qquad \bigcup_{n=1}^{\infty} I_{g^n}\subset V,\qquad g^n(\phi(U))\cap V=\emptyset.

Pure point spectrum conjecture. If d∞=Nd_\infty=N and this condition holds for every real λ\lambda, then

Σpp=∅.\Sigma_{pp}=\emptyset.

The question arises because the non-deterministic spectrum is related to the indeterminacy points of gg, while pure point spectrum beyond the non-deterministic component would suggest that iterates of gg approach those points. The supplied text gives no resolution, so the conjecture remains open.

References

Primary source

Christophe Sabot, “Spectral properties of self-similar lattices and iteration of rational maps”, arXiv:math-ph/0201040 (2003).

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