Elon Lindenstrauss, Klaus Schmidt
We prove that the restriction of a probability measure invariant under a nonhyperbolic, ergodic and totally irreducible automorphism of a compact connected abelian group to the leaves of the central foliation is severely restricted. We also prove a topological analogue of this result: the intersection of every proper closed invariant subset with each central leaf is compact.
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If $α$ is an irreducible nonexpansive ergodic automorphism of a compact abelian group $X$ (such as an irreducible nonhyperbolic ergodic toral automorphism), then $α$ has no finite or infinite state Markov partitions, and there are no nontrivial continuous embeddings of Markov shifts in $X$. In spite of this we are able to construct a symbolic space $V$ and a class of shift-invariant probability measures on $V$ each of which corresponds to an $α$-invariant probability measure on $X$. Moreover, every $α$-invariant probability measure on $X$ arises essentially in this way. The last part of the pa…
This survey gives an account of an algebraic construction of symbolic covers and representations of ergodic automorphisms of compact abelian groups, initiated by A.M. Vershik around 1992 for hyperbolic automorphisms of finite-dimensional tori. The key ingredient in this approach, which was subsequently extended to arbitrary expansive automorphisms of compact abelian groups, is the use of homoclinic points of the automorphism. Although existence and abundance of homoclinic points is intimately connected to expansiveness of the automorphism, it is nevertheless possible to extend certain aspects …
The automorphism group of a one dimensional shift space over a finite alphabet exhibits different types of behavior: for a large class with positive entropy, it contains a rich collection of subgroups, while for many shifts of zero entropy, there are strong constraints on the automorphism group. We view this from a different perspective, considering a single automorphism (and sometimes endomorphism) and studying the naturally associated two dimensional shift system. In particular, we describe the relation between nonexpansive subspaces in this two dimensional system and dynamical properties of…
We show that there exists a polynomial automorphism $f$ of $\mathbb{C}^{3}$ of degree 2 such that for every automorphism $g$ sufficiently close to $f$, $g$ admits a tangency between the stable and unstable laminations of some hyperbolic set. As a consequence, for each $d \ge 2$, there exists an open set of polynomial automorphisms of degree at most $d$ in which the automorphisms having infinitely many sinks are dense. To prove these results, we give a complex analogous to the notion of blender introduced by Bonatti and Diaz.
Stable intersections of Cantor sets and positive density of persistent tangencies for homoclinic bifurcations of automorphisms of $\mathbb{C}^2$
本文研究 $\mathbb{C}^2$ 自同构族的通有同宿切触，证明了若稳定与不稳定流形局部相交 Cantor 集的线性化版本稳定相交，则持久切触参数集在分岔点处具有正密度。
On automorphisms of super-level sets of Green's functions of Hénon maps
本文研究Hénon映射逃逸集及相关格林函数超水平集的自同构，得到逃逸集自同构的局部标准型，刻画了保持逃逸集的$\text{C}^2$整体自同构，还描述了格林函数超水平集的自同构。
For a subshift over a finite alphabet, a measure of the complexity of the system is obtained by counting the number of nonempty cylinder sets of length $n$. When this complexity grows exponentially, the automorphism group has been shown to be large for various classes of subshifts. In contrast, we show that subquadratic growth of the complexity implies that for a topologically transitive shift $X$, the automorphism group $\Aut(X)$ is small: if $H$ is the subgroup of $\Aut(X)$ generated by the shift, then $\Aut(X)/H$ is periodic.
Automorphisms of $\mathbb{C}^2$ with cycles of escaping Fatou components with hyperbolic limit sets
研究形如 $F(z,w)=(e^{-z^m}+ \delta e^{\frac{2 \pi}{m}i}\\, w\\,,\\,z)$ 的 $\mathbb{C}^2$ 非多项式自同构的稳定动力学，揭示了奇偶参数 $m$ 下逃逸Fatou分支循环的周期与双曲极限集特征。
We show that if an automorphism of a standard Borel space does not admit finite invariant measures, then it has a two-set generator modulo the sigma-ideal generated by wandering sets. This implies that if the entropies of invariant probability measures of a Borel system are all less than log(k), then the system admits a k-set generator, and that a wide class of hyperbolic-like systems are classified completely at the Borel level by entropy and periodic points counts.
Hyperspatiality for isomorphisms of stabilized automorphism groups of shifts of finite type
本文研究了有限型移位稳定化自同构群的空间性问题，证明了全移位稳定化自同构群间的同构可由链回归子移位稳定化空间的同胚空间诱导，并推导出其外自同构群不可数等性质。
Structure of hyperbolic polynomial automorphisms of C^2 with disconnected Julia sets
本文在温和耗散条件下，对具有不连通Julia集的C^2双曲多项式自同构，用有限多个准螺线管给出Julia集分量的拓扑描述，建立了精细谱分解与二维Branner-Hubbard理论。
Let phi and psi be endomorphisms of the projective line of degree at least 2, defined over a noetherian commutative ring R with unity. From a dynamical perspective, a significant question is to determine whether phi and psi are conjugate (or to answer the related question of whether a given map phi has a nontrivial automorphism). We show that the space of automorphisms of P^1 conjugating phi to psi is a finite subscheme of PGL(2) (respectively that the automorphism group of phi is a finite group scheme). We construct efficient algorithms for computing the set of conjugating maps (resp. the gro…
Escaping Fatou components with disjoint hyperbolic limit sets
本文构造了二维复空间的自同构，其逃逸Fatou分支循环上恰有两个秩为1的极限函数，且对应极限集为无穷远直线上两个不交的双曲子集。
We survey, and extend, results on the adjoint action of the homeomorphism group $H(X)$ on the space of surjective continuous maps, $C_s(X)$, where $X$ is a Cantor set. We look also at the restriction of the action to various dynamically defined subsets of $C_s(X)$, e. g. the sets of topologically transitive maps, chain transitive maps, chain mixing maps, etc. In each case, we consider whether there exist elements with a dense conjugacy class and if so, what the generic elements look like.
We prove that the Julia set of a Henon type automorphism on C^2 is very rigid: it supports a unique positive ddc-closed current of mass 1. A similar property holds for the cohomology class of the Green current associated with an automorphism of positive entropy on a compact Kaehler surface. Relations between this phenomenon, several quantitative equidistribution properties and the theory of value distribution will be discussed. We also survey some rigidity properties of Henon type maps on C^k and of automorphisms of compact Kaehler manifolds.
Consider a continuous flow of automorphisms of a G-principal bundle which is chain transitive on its compact Hausdorff base. Here G is a connected noncompact semi-simple Lie group with finite center. The finest Morse decomposition of the induced flows on the associated flag bundles were obtained in previous articles. Here we describe the stable sets of these Morse components and, under an additional assumption, their Conley indices.
In this paper, we compute universal minimal flows of groups of automorphisms of uncountable $ω$-homogeneous graphs, $K_n$-free graphs, hypergraphs, partially ordered sets, and their extensions with an $ω$-homogeneous ordering. We present an easy construction of such structures, expanding the jungle of extremely amenable groups.
We study the geometry and dynamics of discrete subgroups $Γ$ of $\PSL(3,\mathbb{C})$ with an open invariant set $Ω\subset \PC^2$ where the action is properly discontinuous and the quotient $Ω/Γ$ contains a connected component whicis compact. We call such groups {\it quasi-cocompact}. In this case $Ω/Γ$ is a compact complex projective orbifold and $Ω$ is a {\it divisible set}. Our first theorem refines classical work by Kobayashi-Ochiai and others about complex surfaces with a projective structure: We prove that every such group is either virtually affine or complex hyperbolic. We then classify…
Let f be a holomorphic automorphism of a compact Kahler manifold (X,ω) of dimension k>1. We study the convex cones of positive closed (p,p)-currents T_p, which satisfy a functional relation $f^*(T_p)=λT_p, λ>1,$ and some regularity condition (PB). Under appropriate assumptions on dynamical degrees we introduce closed finite dimensional cones, not reduced to zero, of such currents. In particular, when the topological entropy h(f) of f is positive, then for some m, there is a positive closed (m,m)-current T_m which satisfies the relation $f^* T_m=\exp(h(f)) T_m$. Moreover,every quasi-p.s.h. func…
Automorphism groups of measures on the Cantor space. Part I: Good measures and Rokhlin properties
本文研究 Cantor 空间上测度自同构群中存在稠密或余瘦共轭类的判据，利用 Fraïssé 理论将好测度刻画为超齐次测度的子类，并确定了取有理值且自同构群承认余瘦共轭类的好测度。
We classify rational surfaces for which the image of the automorphisms group in the group of linear transformations of the Picard group is the largest possible. This answers a question raised by Arthur Coble in 1928, and can be rephrased in terms of periodic orbits of a birational action of an infinite Coxeter group on ordered point sets in the projective plane modulo projective equivalence. We also outline the classification of non-rational surfaces with large automorphism groups.
On automorphisms of $\mathscr{B}$-admissible and related subshifts
借鉴Kim和Roush的思想，研究由倍数集定义的非sofic子移位的自同构群，对B-可容许子移位建立二分法：其自同构群要么平凡，要么包含全移位自同构群的嵌入副本，即巨大。进一步证明B-自由子移位遗传闭包的自同构群在特定条件下也是巨大的。
Thanks to the theory of Coxeter groups, we produce the first family of Calabi-Yau manifolds $X$ of arbitrary dimension $n$, for which $\Bir(X)$ is infinite and the Kawamata-Morrison movable cone conjecture is satisfied. For this family, the movable cone is explicitly described; it's fractal nature is related to limit sets of Kleinian groups and to the Apollonian Gasket. Then, we produce explicit examples of (biregular) automorphisms with positive entropy on some Calabi-Yau manifolds.
We study automorphisms $α$ of a totally disconnected, locally compact group $G$ which are expansive in the sense that, for some identity neighbourhood $U$, the sets $α^n(U)$ (for integers $n$) intersect in the trivial group. Notably, we prove that the automorphism induced by $α$ on $G/N$ for an $α$-stable closed normal subgroup $N$ of $G$ is always expansive. Further results involve the associated contraction groups $U_α$ consisting of all $x$ in $G$ such that $α^n(x) \to e$ as $n$ tends to infinity. If $α$ is expansive, then $W := U_αU_{α^{-1}}$ is an open identity neighbourhood in $G$. We gi…
An open convex set in real projective space is called divisible if there exists a discrete group of projective automorphisms which acts co-compactly. There are many examples of such sets and a theorem of Benoist implies that many of these examples are strictly convex, have $C^1$ boundary, and have word hyperbolic dividing group. In this paper we study a notion of convexity in complex projective space and show that the only divisible complex convex sets with $C^1$ boundary are the projective balls.
Rigidity of the escaping set of polynomial automorphisms of $\mathbb{C}^2$
研究多项式 $\mathbb{C}^2$ 自动同构的逃逸集刚性，证明其自同构群为有限循环群。
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