Continuity of template Julia sets under common roots

Fix a parameter pair (c0,c1)C2(c_0,c_1)\in\mathbb{C}^2 and let s{\bf s} be a template. For a template t=(tk){\bf t}=(t_k), its kk-root is the finite sequence tk=t1,\hdots,tk\overline{\bf t}^{k}=t_1,\hdots,t_k; two templates have a common kk-root when they agree through their kk-th position. Common-root continuity conjecture. For every δ>0\delta>0, there exists nNn\in\mathbb{N} such that, whenever s1{\bf s}_1 and s2{\bf s}_2 have a common nn-root,

d(Jc0,c1(s1),Jc0,c1(s2))<δ,d\bigl(J_{c_0,c_1}({\bf s}_1),J_{c_0,c_1}({\bf s}_2)\bigr)<\delta,

where dd is the Hausdorff distance between two sets. This conjecture is motivated by numerical simulations showing that templates agreeing for an initial segment produce increasingly similar Julia sets. No proof or resolution is supplied.

Sources & referencesView supporting material

Primary source

Anca Radulescu and Ariel Pignatelli, “Symbolic template iterations of complex quadratic maps”, arXiv:1503.05775 (2015).

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