Valentin Huguin
In this article, we prove that every unicritical polynomial map that has only rational multipliers is either a power map or a Chebyshev map. This provides some evidence in support of a conjecture by Milnor concerning rational maps whose multipliers are all integers.
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For rational numbers $c$, we present a trichotomy of the set of totally real (totally $p$-adic, respectively) preperiodic points for maps in the quadratic unicritical family $f_c(x)=x^2+c$. As a consequence, we classify quadratic polynomials $f_c$ with rational parameters $c\in\mathbb{Q}$ so that $f_c$ has only finitely many totally real (totally $p$-adic, respectively) preperiodic points. These results rely on an adelic Fekete-type theorem and dynamics of the filled Julia set of $f_c$. Moreover, using a numerical criterion introduced in [NP], we make explicit calculations of the set of totall…
We show that if $β>1$ is a rational number and the Julia set $J$ of the holomorphic correspondence $z^β+c$ is a locally eventually onto hyperbolic repeller, then the Hausdorff dimension of $J$ is bounded from above by the zero of the associated pressure function. As a consequence, we conclude that the Julia set of the correspondence has zero Lebesgue measure for parameters close to zero, whenever $q^2<p$ and $β=p/q$ in lowest terms.
Let $K$ be an algebraically closed field of characteristic zero, and let $\mathcal{K} := K(t)$ be the rational function field over $K$. For each $d \ge 2$, we consider the unicritical polynomial $f_d(z) := z^d + t \in \mathcal{K}[z]$, and we ask the following question: If we fix $α\in \mathcal{K}$ and integers $M \ge 0$, $N \ge 1$, and $d \ge 2$, does there exist a place $\mathfrak{p} \in \operatorname{Spec} K[t]$ such that, modulo $\mathfrak{p}$, the point $α$ enters into an $N$-cycle after precisely $M$ steps under iteration by $f_d$? We answer this question completely, concluding that the a…
Misiurewicz points and subhyperbolicity in unicritical algebraic correspondences
本文首次定义了单临界代数对应关系中Misiurewicz参数，并证明在这些参数处，对应关系在Julia集邻域内均匀展开标准orbifold度量。
The number of rational iterated preimages of the origin under unicritical polynomial maps
本文通过几何分析与椭圆Chabauty方法，确定了单临界多项式映射下原点有理迭代原像的完整数量，填补了二次与高次情形的空白。
In an analogy with the Galois homothety property for torsion points of abelian varieties that was used in the proof of the Mordell-Lang conjecture, we describe a correspondence between the action of a Galois group and the dynamical action of a rational map. For nonlinear polynomials with rational coefficients, the irreducibility of the associated dynatomic polynomial serves as a convenient criterion, although we also verify that the correspondence occurs in several cases when the dynatomic polynomial is reducible. The work of Morton, Morton-Patel, and Vivaldi-Hatjispyros in the early 1990s con…
Given a polynomial $p$, the degree of its Chebyshev's method $C_p$ is determined. If $p$ is cubic then the degree of $C_p$ is found to be $4,6$ or $7$ and we investigate the dynamics of $C_p$ in these cases. If a cubic polynomial $p$ is unicritical or non-generic then, it is proved that the Julia set of $C_p$ is connected. The family of all rational maps arising as the Chebyshev's method applied to a cubic polynomial which is non-unicritical and generic is parametrized by the multiplier of one of its extraneous fixed points. Denoting a member of this family with an extraneous fixed point with …
Let $k$ be a number field with algebraic closure $\bar{k}$, and let $S$ be a finite set of places of $k$ containing all the archimedean ones. Fix $d\geq 2$ and $α\in \bar{k}$ such that the map $z\mapsto z^d+α$ is not postcritically finite. Assuming a technical hypothesis on $α$, we prove that there are only finitely many parameters $c\in\bar{k}$ for which $z\mapsto z^d+c$ is postcritically finite and for which $c$ is $S$-integral relative to $(α)$. That is, in the moduli space of unicritical polynomials of degree d, there are only finitely many PCF $\bar{k}$-rational points that are $((α),S)$-…
We show that the set of conjugacy classes of cubic polynomials with a prefixed critical point, of preperiod $k\geq 1$, is an irreducible algebraic curve. We also establish an analogous result for quadratic rational maps. We then study a closely related question concerning the irreducibility (over $\mathbb Q$) of the set of conjugacy classes of unicritical polynomials, of degree $D\geq 2$, with a preperiodic critical point. Our proofs are purely algebraic.
Unicritical polynomials over $abc$-fields: from uniform boundedness to dynamical Galois groups
本文在$abc$-域上完全分类了单临界多项式的$K$-有理预周期点肖像（共十三种），证明其数量一致有界，并应用于构造具有大动力伽罗瓦群的不可约多项式。
Arithmetic properties of multiplier polynomials for certain polynomial maps
本文研究了某些1-参数多项式族的乘子多项式的算术性质，证明了特定多项式的整性定理，并给出了单临界多项式抛物线参数的朴素高度统一上界及二次抛物线参数的确定结果。
In this article, we show that every rational map whose multipliers all lie in a given number field is a power map, a Chebyshev map or a Lattès map. This strengthens a conjecture by Milnor concerning rational maps with integer multipliers, which was recently proved by Ji and Xie.
Blow-up of multipliers in meromorphic families of rational maps
本文研究了黎曼球面上有理映射的单参数全纯退化族中周期循环乘子的爆破现象。
In this article, we consider a counting problem for orbits of hyperbolic rational maps on the Riemann sphere, where constraints are placed on the multipliers of orbits. Using arguments from work of Dolgopyat, we consider varying and potentially shrinking intervals, and obtain a result which resembles a local central limit theorem for the logarithm of the absolute value of the multiplier and an equidistribution theorem for the holonomies.
We consider the space of degree $n\ge 2$ rational maps of the Riemann sphere with $k$ distinct marked periodic orbits of given periods. First, we show that this space is irreducible. For $k=2n-2$ and with some mild restrictions on the periods of the marked periodic orbits, we show that the multipliers of these periodic orbits, considered as algebraic functions on the above mentioned space, are algebraically independent over $\mathbb C$. Equivalently, this means that at its generic point, the moduli space of degree $n$ rational maps can be locally parameterized by the multipliers of any $2n-2$ …
Entire maps with rational preperiodic points and multipliers
本文证明了对于非实数域的数域，存在预周期点和乘数均位于其中的整映射稠密集，并发现了一个乘数全为有理数且不共轭于仿射映射的逃逸类二次映射。
In the moduli space of degree d polynomials, we prove the equidistribution of postcritically finite polynomials toward the bifurcation measure. More precisely, using complex analytic arguments and pluripotential theory, we prove the exponential speed of convergence for C 2-observables. This improves results obtained with arithmetic methods by Favre and Rivera-Letellier in the unicritical family and Favre and the first author in the space of degree d polynomials. We deduce from that the equidistribution of hyperbolic parameters with (d -- 1) distinct attracting cycles of given multipliers towar…
In this article, we prove that every quadratic rational map whose multipliers all lie in the ring of integers of a given imaginary quadratic field is a power map, a Chebyshev map or a Lattès map. In particular, this provides some evidence in support of a conjecture by Milnor concerning rational maps whose multipliers are all integers.
In an algebraic family of rational maps of $\mathbb{P}^1$, we show that, for almost every parameter for the trace of the bifurcation current of a marked critical value, the critical value is Collet-Eckmann. This extends previous results of Graczyk and Świcatek in the unicritical family, using Makarov theorem. Our methods are based instead on ideas of laminar currents theory.
Uniformization of Julia sets of geometrically finite rational maps
该研究刻画了Julia集与Schottky集拟共形等价的几何有限有理映射，证明了几何有限单临界多项式无穷远吸引域闭包与Schottky集拟共形等价的充要条件，并给出了拟圆周对的相关动力学刻画。
Let f be a rational function such that the multipliers of all repelling periodic points are real. We prove that the Julia set of such a function belongs to a circle. Combining this with a result of Fatou we conclude that whenever J(f) belongs to a smooth curve, it also belongs to a circle. Then we discuss rational functions whose Julia sets belong to a circle.
We study angles of multipliers of repelling cycles for hyperbolic rational maps in $\mathbb C(z)$. For a fixed $K \gg 1$, we show that almost all intervals of length $2π/K$ in $(-π,π]$ contain a multiplier angle with the property that the norm of the multiplier is bounded above by a polynomial in $K$.
Multiplier scales of a sequence of rational maps
该研究分析退化复有理映射序列的乘子行为，揭示周期点乘子要么一致有界要么以共同标度激增，并借助Ahbyankar定理证明非平凡乘子标度最多有2d-2个。
Given a polynomial or a rational map f we associate to it a space of maps. We introduce local coordinates in this space, which are essentially the set of critical values of the map. Then we consider an arbitrary periodic orbit of f with multiplier ρ\not=1 as a function of the local coordinates, and establish a simple connection between the dynamical plane of f and the function ρin the space associated to f. The proof is based on the theory of quasiconformal deformations of rational maps. As a corollary, we show that multipliers of non-repelling periodic orbits are also local coordinates in the…
Independence of multipliers via degenerations of rational maps
本文通过有理映射的退化方法，证明次数为$d$的有理映射中任意$2d-2$个不同周期轨道的乘子代数独立，条件为至多$d$个不动点，并改进了早期结果。
Dynamical Systems of Correspondences on the Projective Line II: Degrees of Multiplier Maps
本文研究乘子反问题，给出等谱对应数量的显式上界，并以两种计算方法证明 Hutz-Tepper 关于一般三次态射乘子唯一性结果的勘误修正。
New Normal Forms For Degree Three Polynomials and Rational Functions
针对动力系统模空间中共轭类代表选取的有理性难题，提出不动点集与乘子集相等的三次多项式范式，并分类具备类似性质的三次有理映射。
Newton's method applied to rational functions: Fixed points and Julia sets
本文研究了牛顿映射在有理函数中的固定点与朱利亚集性质，证明了特定条件下朱利亚集的连通性和局部连通性。
Generic reconstruction of rational maps from multipliers of periods one and two
本文证明对任意次数d≥2且特征非2的域，模空间上由周期一、二乘子构成的谱态射双有理于其像闭包，从而在代数闭域上通用单射，证实了Ji-Xie猜想，方法涉及正规形、非阿基米德退化与对不变量重构。
On the dynamics of Stirling's iterative root-finding method for rational functions
本文研究Stirling迭代求根方法对有理函数和多项式的动力学，证明简单零点为超吸引不动点、外来不动点有理中性、多项式Julia集连通，并证明该方法对Möbius映射的Herman环最多为2个。
Entire or rational maps with integer multipliers
本文用微分方程方法替代非阿基米德动力学结果，重新证明了 Ji 和 Xie 关于乘子均为虚二次域整数环元素的有理函数分类定理，并将其推广到整函数情形。
We consider moduli spaces of dynamical systems of correspondences over the projective line as a generalization of moduli spaces of dynamical systems of endomorphisms on the projective line. We obtain the rationality of the moduli spaces. The rationality of the moduli space of degree $(d,e)$ correspondences is obtained from a representation-theoretic projection to the one for the usual dynamical systems of degree $d+e-1$. We also show that the multiplier maps for the fixed points and the multiplier index theorem (Woods Hole formula) are also reduced through the projection and obtain the reduced…
We study critical orbits and bifurcations within the moduli space of quadratic rational maps on $\mathbb{P}^1$. We focus on the family of curves, $Per_1(λ)$ for $λ$ in $\mathbb{C}$, defined by the condition that each $f\in Per_1(λ)$ has a fixed point of multiplier $λ$. We prove that the curve $Per_1(λ)$ contains infinitely many postcritically-finite maps if and only if $λ= 0$; addressing a special case of [BD2, Conjecture 1.4]. We also show that the two critical points of a map $f$ define distinct bifurcation measures along $Per_1(λ)$.
Generalized rescaling limits of a sequence of rational maps
研究有理映射序列的广义缩放极限，通过非阿基米德域上的理性映射重构，构建树结构并限制其大小，应用于二次有理映射并证明小乘数周期的统一界。
Homoclinic orbits, multiplier spectrum and rigidity theorems in complex dynamics
本文利用复动力学与非阿基米德动力学工具，给出 McMullen 乘子谱刚性定理的新证明，并将其推广到长度谱情形，同时解决 Milnor 关于例外映射的两个猜想。
Let $K$ be an algebraically closed field of characteristic 0 that is complete with respect to a non-archimedean absolute value. We establish a locally uniform approximation formula of the Lyapunov exponent of a rational map $f$ of $\mathbb{P}^1$ of degree $d>1$ over $K$, in terms of the multipliers of $n$-periodic points of $f$, with an explicit control in terms of $n$, $f$ and $K$. As an immediate consequence, we obtain an estimate for the blow-up of the Lyapunov exponent near a pole in one-dimensional families of rational maps over $K$. Combined with our former archimedean version, this non-…
Multiplier rigidity for complex Hénon maps
复Hénon映射的乘子刚性问题，通过乘子谱或不稳定乘子确定，且在多次数和多Jacobian固定时保持刚性。
Emergence of Mandelbrot-like and Julia-like Structures in Parameter Slices of Rational Maps
研究有理映射参数切片中的分形结构，揭示其与多项式家族的相似性及动态特性。
McMullen proved the moduli space of complex rational maps can be parametrized by the spectrum of all periodic-point multipliers up to a finite amount of data, with the well-understood exception of Lattès maps. We generalize his method to large positive characteristic. McMullen's method is analytic; a modified version of the method using rigid analysis works over a function field over a finite field of characteristic larger than the degree of the map. Over a finite field with such characteristic it implies that, generically, rational maps can indeed be parametrized by their multiplier spectra u…
We discuss analogues of the prime number theorem for a hyperbolic rational map f of degree at least two on the Riemann sphere. More precisely, we provide counting estimates for the number of primitive periodic orbits of f ordered by their multiplier, and also obtain equidistribution of the associated holonomies; both estimates have power savings error terms. Our counting and equidistribution results will follow from a study of dynamical zeta functions that have been twisted by characters of $S^1$. We will show that these zeta functions are non-vanishing on a half plane $\Re(s) > δ- ε$, where $…
In this paper, we study the dynamics of degenerating sequences of rational maps on Riemann sphere $\hat{\mathbb{C}}$ using $\mathbb{R}$-trees. Given a sequence of degenerating rational maps, we give two constructions for limiting dynamics on $\mathbb{R}$-trees: one geometric and one algebraic. The geometric construction uses the ultralimit of rescalings of barycentric extensions of rational maps, while the algebraic construction uses the Berkovich space of complexified Robinson's field. We show the two approaches are equivalent. The limiting dynamics on the $\mathbb{R}$-tree are analogues to i…
Let $K$ be a complete, algebraically closed non-archimedean valued field, and let $φ(z) \in K(z)$ have degree two. We describe the crucial set of $φ$ in terms of the multipliers of $φ$ at the classical fixed points, and use this to show that the crucial set determines a stratification of the moduli space $\mathcal{M}_2(K)$ related to the reduction type of $φ$. We apply this to settle a special case of a conjecture of Hsia regarding the density of repelling periodic points in the non-archimedean Julia set.
Let $Λ$ be a quasi-projective variety and assume that, either $Λ$ is a subvariety of the moduli space $\mathcal{M}_d$ of degree $d$ rational maps, or $Λ$ parametrizes an algebraic family $(f_λ)_{λ\inΛ}$ of degree $d$ rational maps on $\mathbb{P}^1$. We prove the equidistribution of parameters having $p$ distinct neutral cycles towards the $p$-th bifurcation current letting the periods of the cycles go to $\infty$, with an exponential speed of convergence. We deduce several fundamental consequences of this result on equidistribution and counting of hyperbolic components. A key step of the proof…
In this paper we study analytic families of degree 2 parabolic-like mappings (as we defined in arXiv:1111.7150). We prove that the corresponding family of hybrid conjugacies induces a continuous map, which associates to each parameter the multiplier of the fixed point of the hybrid equivalent rational map P_A. We prove that, under suitable conditions, this map restricts to a ramified covering from the connectedness locus of the family of parabolic-like maps to the connectedness locus M_1 \ {1}.
Locating critical points attracted to p-adic attracting cycles
本文研究非阿基米德动力学中吸引周期吸引临界点的条件，通过分析乘数建立精确判定方法。
Mating parabolic rational maps with Hecke groups
研究证明具有抛物固定点且具有完全不变且单连通立即吸引盆地的有理映射可与海克群H_{d+1}配对，通过代数对应实现配对，验证了抛物版本的猜想。
Space spanned by characteristic exponents
论文证明了乘积谱和长度谱的刚性结果，展示非例外有理映射的特征指数生成的有理向量空间有无限维，推广Levy和Tucker的问题，并用长度谱刻画后临界有限映射，还证明了射影空间上内射的Zariski稠密轨道猜想。
Chow Quotient Moduli Space of Dynamical Systems on the Projective Line and Rescaling Limits
本文研究射影直线上次数为d的有理自映射模空间的Chow商紧化，计算三维轨道环度数，引入带标记Chow商记录重标度极限，并扩展不动点乘子映射。
We prove that given any $θ_1,\ldots,θ_{2d-2}\in \R\setminus\Z$, the support of the bifurcation measure of the moduli space of degree $d$ rational maps coincides with the closure of classes of maps having $2d-2$ neutral cycles of respective multipliers $e^{2iπθ_1},\ldots,e^{2iπθ_{2d-2}}$. To this end, we generalize a famous result of McMullen, proving that homeomorphic copies of $(\partial \Mand)^{k}$ are dense in the support of the $k^{th}$-bifurcation current $T^k_\bif$ in general families of rational maps, where $\Mand$ is the Mandelbrot set. As a consequence, we also get sharp dimension est…
Symmetry and dynamics of Chebyshev's method
本文研究切比雪夫求根方法的对称性与动力学，证明满足缩放定理时中心化多项式的对称群包含于切比雪夫映射的对称群，并刻画了等号成立的多类条件及相应朱利亚集的连通性与局部连通性。
Relaxed Newton's Method as a Family of Root-finding Methods: Dynamics and Convergence
本文研究了放松牛顿法作为求根方法族的动力学与收敛性，揭示了其在不同多项式下的收敛行为及复杂动力学特性。
The moduli space of a rational map is Carathéodory hyperbolic
本文通过将非 flexible Lattès 有理映射的模空间全纯嵌入维数 $2d-2$ 的正规仿射簇并证明其像预紧，证实该模空间具有 Carathéodory 双曲性，解决 McMullen 猜想。
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