Positive-measure disconnectedness conjecture for random Julia sets

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Let T\mathbb T be the parameter circle, and for each u∈Tu\in\mathbb T let Ju\mathcal J_u be the corresponding random Julia set. A subset of T\mathbb T has positive Lebesgue measure when its Lebesgue measure is positive.

Positive-measure disconnectedness conjecture. There exists a set of positive Lebesgue measure Λ⊂T\Lambda\subset\mathbb T such that Ju\mathcal J_u is disconnected for all u∈Λu\in\Lambda.

This conjecture describes parameter values with disconnected random Julia sets and is stated as a reasonable expectation. The source gives no resolution.

References

Primary source

Abbas Fakhari, Ale Jan Homburg and Sebastian van Strien, “Intermingled basins: Kan's example on the Riemann sphere”, arXiv:2606.04783 (2026).

Additional references

2 papers in this index state this conjecture (2009–2026). The statement above is taken from the most recent of them; the others are arXiv:0911.3927.

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