Conformal-radius bound for polynomials with an indifferent fixed point

Let ff be a polynomial of degree dd with an indifferent fixed point at the origin. Let cic_i be the critical points of ff, let θ\theta be the rotation number at the origin, and let R(f)R(f) denote the conformal radius of the Siegel disk at the origin. Polynomial conformal-radius conjecture. There exists a constant C=C(d)RC=C(d)\in\mathbb R such that

logR(f)Y(θ)d1+logminci+C.\log R(f)\leq -\frac{Y(\theta)}{d-1}+\log\min|c_i|+C.

This conjecture proposes a degree-dependent extension of Yoccoz's quadratic conformal-radius estimate to arbitrary polynomials, with the nearest critical point providing the geometric scale. The supplied text gives no resolution, so its status remains open.

Sources & referencesView supporting material

Primary source

Xavier Buff and Arnaud Cheritat, “A new proof of a conjecture of Yoccoz, Remarks, New results”, arXiv:math/0604470 (2006).

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