Visibility characterization by cluster sets of non-visible geodesics

Let ΩCN\Omega\subset\mathbb C^N be a bounded convex domain. Let {γk}\{\gamma_k\} be a sequence of non-visible geodesic segments and define

Γ({γk}):={pΩ:{tkn}[0,1] such that limnγkn(tkn)=p}.\Gamma(\{\gamma_k\}):=\{p\in\partial\Omega: \exists\{t_{k_n}\}\subset[0,1]\text{ such that }\lim_{n\to\infty}\gamma_{k_n}(t_{k_n})=p\}.

The cluster-set conjecture. If p,qΓ({γk})p,q\in\Gamma(\{\gamma_k\}) and pqp\ne q, then either

{tp+(1t)q:0<t<1}Ω,\{tp+(1-t)q:0<t<1\}\subset\Omega,

or

{tp+(1t)q:0t1}Ω\{tp+(1-t)q:0\le t\le1\}\subset\partial\Omega

and

(C(pq)+q)Ω=.(\mathbb C(p-q)+q)\cap\Omega=\emptyset.

This describes the possible boundary cluster sets of non-visible geodesic segments and is intended to clarify the geometric obstruction to visibility in bounded convex domains; the source provides no resolution.

Sources & referencesView supporting material

Primary source

Filippo Bracci and Ahmed Yekta Ökten, “Some open questions and conjectures about visibility and iteration in bounded convex domains in C^N”, arXiv:2507.19967 (2025).

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