Absence of pure point spectrum under dynamical avoidance

Let dd_\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 UCU\subset\mathbb C and VLGV\subset\mathbb L^G such that

λU,n=1IgnV,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.

Sources & referencesView supporting material

Primary source

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

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