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The moduli space of polynomial maps and their fixed-point multipliers: II. Improvement to the algorithm and monic centered polynomials

Part of: Families, fibrations Complex dynamical systems Combinatorics

Published online by Cambridge University Press:  03 February 2023

TOSHI SUGIYAMA
TOSHI SUGIYAMA*
Affiliation:
Mathematics Studies, Gifu Pharmaceutical University, Mitahora-higashi 5-6-1, Gifu-city, Gifu 502-8585, Japan
*
e-mail: sugiyama-to@gifu-pu.ac.jp
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Abstract

We consider the family $\mathrm {MC}_d$ of monic centered polynomials of one complex variable with degree $d \geq 2$, and study the map $\widehat {\Phi }_d:\mathrm {MC}_d\to \widetilde {\Lambda }_d \subset \mathbb {C}^d / \mathfrak {S}_d$ which maps each $f \in \mathrm {MC}_d$ to its unordered collection of fixed-point multipliers. We give an explicit formula for counting the number of elements of each fiber $\widehat {\Phi }_d^{-1}(\bar {\unicode{x3bb} })$ for every $\bar {\unicode{x3bb} } \in \widetilde {\Lambda }_d$ except when the fiber $\widehat {\Phi }_d^{-1}(\bar {\unicode{x3bb} })$ contains polynomials having multiple fixed points. This formula is not a recursive one, and is a drastic improvement of our previous result [T. Sugiyama. The moduli space of polynomial maps and their fixed-point multipliers. Adv. Math. 322 (2017), 132–185] which gave a rather long algorithm with some induction processes.

Keywords

complex dynamicsfixed-point multipliersmoduli space of polynomial mapspartition of integersinclusion-exclusion formula

MSC classification

Primary: 37F10: Polynomials; rational maps; entire and meromorphic functions
Secondary: 05A19: Combinatorial identities, bijective combinatorics 14D20: Algebraic moduli problems, moduli of vector bundles
Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 43 , Issue 11 , November 2023 , pp. 3777 - 3795
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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