D. -Q. Zhang
In these notes, we consider self-maps of degree > 1 on a weak del Pezzo surface X of degree < 8. We show that there are exactly 12 such X, modulo isomorphism. In particular, K_X^2 > 2, and if X has one self-map of degree > 1 then for every positive integer d there is a self-map of degree d^2 on X. We prove the Sato conjecture in the present case, the general case of which has been proved by N. Nakayama.
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We prove that a quasi-finite endomorphism of an algebraic variety over an algebraically closed field of characteristic zero, that is injective on the complement of a closed subvariety, is an automorphism. We also prove that an endomorphism of complex algebraic variety that is injective on the complement of a closed subvariety of codimension at least $2$, is an automorphism.
On Endomorphisms of Projective Algebraic Varieties
本文研究了射影簇内射映射的代数动力学，通过刻画迭代像、Stein分解和稳定性现象，完成Brion的结果。
Using only basic topological properties of real algebraic sets and regular morphisms we show that any injective regular self-mapping of a real algebraic set is surjective. Then we show that injective morphisms between germs of real algebraic sets define a partial order on the equivalence classes of these germs divided by continuous semi-algebraic homeomorphisms. We use this observation to deduce that any injective regular self-mapping of a real algebraic set is a homeomorphism. We show also a similar local property. All our results can be extended to arc-symmetric semi-algebraic sets and injec…
We classify non-algebraic compact Kähler threefolds admitting an endomorphism $f: X \to X$ of degree at least two.
Essential dimensions of polarized endomorphisms of certain algebraic surfaces
本文研究了双有理直纹光滑射影曲面的极化自同态，在Galois假设下，给出了依赖于曲面X的deg(f)显式下界，肯定地回答了Kollár和Zhuang关于f不可压缩性的问题，并举例说明下界的最优性。
We classify noninvertible, holomorphic selfmaps of the projective plane that preserve an algebraic web. In doing so, we obtain interesting examples of critically finite maps.
We first show that any connected algebraic group over a perfect field is the neutral component of the automorphism group scheme of some normal projective variety. Then we show that very few connected algebraic semigroups can be realized as endomorphisms of some projective variety X, by describing the structure of all connected subsemigroup schemes of End(X).
Affine algebraic monoids as endomorphisms' monoids of finite-dimensional algebras
本文证明了任意仿射代数幺半群均可实现为某个有限维非结合代数的自同态幺半群。
We prove a conjecture of Medvedev and Scanlon for endomorphisms of connected commutative linear algebraic groups $G$ defined over an algebraically closed field $\mathbb{k}$ of characteristic $0$. That is, if $Φ\colon G\longrightarrow G$ is a dominant endomorphism, we prove that one of the following holds: either there exists a non-constant rational function $f\in \mathbb{k}(G)$ preserved by $Φ$ (i.e., $f\circ Φ= f$), or there exists a point $x\in G(\mathbb{k})$ whose $Φ$-orbit is Zariski dense in $G$.
We investigate int-amplified endomorphisms on normal projective surfaces. We prove that the output of the equivariant MMP is either a Q-abelian surface, a (equivariant) quasi-étale quotient of a smooth projective surface, a Mori dream space, or a projective cone of an elliptic curve.
In this paper we give some properties of the algebraic and geometric structure of the endomorphisms monoid of a homogeneous vector bundle.
Endomorphisms of rank one Gorenstein del Pezzo surfaces
本文研究了Picard秩为1的Gorenstein del Pezzo表面的内射映射性质，证明其与托尔品种的商结构有关，并对这类商进行了分类。
We prove Kawaguchi-Silverman conjecture (KSC) and Shibata's conjecture on ample canonical heights for endomorphisms on several classes of algebraic varieties including varieties of Fano type and projective toric varieties. We also prove KSC for group endomorphisms of linear algebraic groups. We also propose a possible approach to the conjecture using equivariant MMP.
Endomorphisms of Equivariant Algebraic $K$-theory
本文证明了有限常值群概形作用下等变代数K-理论由Grassmannian的余极限表示，并通过显式计算Grassmannian的等变K-理论，证明了等变动机空间与无限Grassmannian的自同态集一致。
Endomorphisms of singular del Pezzo surfaces
本文证明具有E_8型du Val奇异点的奇异del Pezzo表面不存在度数大于1的内射映射，扩展了Amerik-Rovinsky-Van de Ven的方法用于堆栈。
On the injective self-maps of algebraic varieties
本文证明了宫西猜想在非奇异簇、曲面及局部完全交集且余维数2处正则的簇上成立，并讨论了诱导非奇异轨迹自同构的实例及孤立奇点情形。
We present a complete classification of complex projective surfaces $X$ with nontrivial self-maps (i.e. surjective morphisms $f:X\rightarrow X$ which are not isomorphisms) of any given degree. The starting point of our classification are results contained in Fujimoto and Nakayama that provide a list of surfaces that admit at least one nontrivial self-map. We then proceed by a case by case analysis that blends geometrical and arithmetical arguments in order to exclude that certain prime numbers appear as degrees of nontrivial self-maps of certain surfaces.
We compute endomorphism algebras of Kuga-Satake varieties associated to K3 surfaces.
Algebraic relations over finite fields that preserve the endomorphism rings of CM $j$-invariants
本文刻画有限域上使几乎所有几何点坐标对应同构自同态环椭圆曲线 $j$-不变量的整仿射平面曲线，建立正特征版 André–Oort 型结果，并解决模支集问题。
Let S and R be the rings of regular functions on affine algebraic varieties over a field of characteristic 0, R be embedded as a subring in S, and F : S --> S be an endomorphism such that F(R) subset R. Suppose that every ideal of height 1 in R generates a proper ideal in S, and the spectrum of R has no selfintersection points. We show that if F is an automorphism so is F|_R : R --> R. When R and S have the same transcendence degree then the fact that F|_R is an automorphisms implies that F is an automorphism.
On injective endomorphisms of symbolic schemes
本文将 Gromov 的符号代数簇自同态理论推广至概形上的元胞自动机，研究闭像、满射、可逆等性质，并否定了逆非代数的双射复仿射代数元胞自动机的存在性。
Invariant sets and nilpotency of endomorphisms of algebraic sofic shifts
本文引入代数sofic子移位并研究其自同态，将有限字母表元胞自动机中关于动力学不变集与幂零性的经典结果推广至该框架，证明了在温和假设及群与拓扑混合条件下幂零性与极限集结构的等价关系。
We prove that a smooth hypersurface of degree >2 and dimension >1 admits no endomorphism of degree >1 (for hyperquadrics this is due to Paranjape and Srinivas). We then collect some general results on endomorphisms of projective manifolds; we prove in particular that ramified endomorphisms occur only on varieties of negative Kodaira dimension, and we classify those Del Pezzo surfaces which admit such endomorphism.
Let $G$ be a group and let $X$ be an algebraic variety over an algebraically closed field $k$ of characteristic zero. Denote $A=X(k)$ the set of rational points of $X$. We investigate invertible algebraic cellular automata $τ\colon A^G \to A^G$ whose local defining map is induced by some morphism of algebraic varieties $X^M \to X$ where $M$ is a finite memory. When $G$ is locally embeddable into finite groups (LEF), then we show that the inverses of reversible algebraic cellular automata are automatically algebraic cellular automata. Generalizations are also obtained for finite product Hopfian…
Let $G$ be an amenable group and let $X$ be an irreducible complete algebraic variety over an algebraically closed field $K$. Let $A$ denote the set of $K$-points of $X$ and let $τ\colon A^G \to A^G$ be an algebraic cellular automaton over $(G,X,K)$, that is, a cellular automaton over the group $G$ and the alphabet $A$ whose local defining map is induced by a morphism of $K$-algebraic varieties. We introduce a weak notion of pre-injectivity for algebraic cellular automata, namely $(*)$-pre-injectivity, and prove that $τ$ is surjective if and only if it is $(*)$-pre-injective. In particular, $τ…
Images of dominant endomorphisms of affine space
本文研究仿射空间自同态的像，证明对任意维数至多 n-2 的代数簇 Z，存在双有理簇 W 及满射态射 A^n 到 A^n\W，并给出猜想性方法。
Special endomorphisms of QM abelian surfaces
研究量子力学阿贝尔曲面模空间，推广库德拉 - 拉波波特 - 杨定理，给出具有特定量子力学次数特殊自同态的该模空间算术次数公式。
Multiband linear cellular automata and endomorphisms of algebraic vector groups
本文建立了多带线性元胞自动机与有限域上代数幂幺群自同态之间的对应关系，并利用代数方法推导出不动点数、zeta函数二分性及周期轨道数的新结果。
On the computation of endomorphism rings of abelian surfaces over finite fields
本文从计算角度研究有限域上主极化阿贝尔曲面的自同态环，重点处理非通常和非单簇情形，综述已知结果并补充改进与缺失结果。
The Tate conjecture for squares of K3 surfaces over finite fields was recently proved by Ito-Ito-Koshikawa. We give a more geometric proof when the characteristic is at least 5. The main idea is to use twisted derived equivalences between K3 surfaces to link the Tate conjecture to finiteness results over finite fields, in the spirit of Tate.
We give a classification of all principally polarized abelian surfaces that admit an $(l,l)$-isogeny to themselves, and show how to compute all the abelian surfaces that occur. We make the classification explicit in the simplest case $l=2$. As part of our classification, we also show how to find all principally polarized abelian surfaces with multiplication by a given imaginary quadratic order.
It is conjectured that there exist finitely many isomorphism classes of simple endomorphism algebras of abelian varieties of GL_2-type over \Q of bounded dimension. We explore this conjecture when particularized to quaternion endomorphism algebras of abelian surfaces by giving a moduli interpretation which translates the question into the diophantine arithmetic of Shimura curves embedded in Hilbert surfaces. We address the resulting problems on these curves by local and global methods, including Chabauty techniques on explicit equations of Shimura curves.
For families of $K3$ surfaces, we establish a sufficient criterion for real or complex multiplication. Our criterion is arithmetic in nature. It may show, at first, that the generic fibre of the family has a nontrivial endomorphism field. Moreover, the endomorphism field does not shrink under specialisation. As an application, we present two explicit families of $K3$ surfaces having real multiplication by $\bbQ(\sqrt{2})$ and $\bbQ(\sqrt{5})$, respectively.
We compute the set of naive pointed homotopy classes of endomorphisms of the projective line P^1 over the spectrum of a field. Our computation compares well with Fabien Morel's one of the motivic pointed homotopy classes of endomorphisms of P^1: there is an a priori monoid structure on the set of naive homotopy classes such that canonical map from this monoid to group of motivic homotopy classes is a group completion.
For a dominant rational self-map on a smooth projective variety defined over a number field, Kawaguchi and Silverman conjectured that the (first) dynamical degree is equal to the arithmetic degree at a rational point whose forward orbit is well-defined and Zariski dense. We prove this conjecture for surjective endomorphisms on smooth projective surfaces. For surjective endomorphisms on any smooth projective varieties, we show the existence of rational points whose arithmetic degrees are equal to the dynamical degree. Moreover, we prove that there exists a Zariski dense set of rational points h…
Let $G$ be a group. Let $X$ be a connected algebraic group over an algebraically closed field $K$. Denote by $A=X(K)$ the set of $K$-points of $X$. We study a class of endomorphisms of pro-algebraic groups, namely algebraic group cellular automata over $(G,X,K)$. They are cellular automata $τ\colon A^G \to A^G$ whose local defining map is induced by a homomorphism of algebraic groups $X^M \to X$ where $M\subset G$ is a finite memory set of $τ$. Our first result is that when $G$ is sofic, such an algebraic group cellular automaton $τ$ is invertible whenever it is injective and $\text{char}(K)=0…
We introduce an algebraicity criteria. It has the following form: under certain conditions, an analytic subvariety of some algebriac variety over a global field $K$, if it contains many $K$-points, then it is algebraic over $K.$ This gives a way to show the transcendence of points via the transcendence of analytic subvarieties. Such a situation often appears when we have a dynamical system, because we can often produce infinitely many points from one point via iterates. Combing this criteria and the study of invariant subvarieties, we get some results on the transcendence in arithmetic dynamic…
On the dynamics of endomorphisms of affine surfaces
将Favre-Jonsson的赋值理论从复仿射平面推广到任意域上的仿射曲面，构造特征赋值并证明第一动力学次数是次数≤2的代数整数，进而得到loxodromic自同构第一动力学次数的刚性结果。
We study the algbraic dynamics for endomorphisms of projective spaces with coefficients in a p-adic field whose reduction in positive characteritic is the Frobenius. In particular, we prove a version of the dynamical Manin-Mumford conjecture and the dynamical Mordell-Lang conjecture for the coherent backward orbits for such endomorphisms. We also give a new proof of a dynamical version of the Tate-Voloch conjecture in this case. Our method is based on the theory of perfectoid spaces introduced by P. Scholze. In the appendix, we prove that under some technical condition on the field of definiti…
In this paper we prove the following theorem. Let $f$ be a dominant endomorphism of a smooth projective surface over an algebraically closed field of characteristic $0$. If there is no nonconstant invariant rational function under $f$, then there exists a closed point whose orbit under $f$ is Zariski dense. This result gives us a positive answer to the Zariski dense orbit conjecture proposed by Medvedev and Scanlon, by Amerik, Bogomolov and Rovinsky, and by Zhang, for endomorphisms of smooth projective surfaces. Moreover, we define a new canonical topology on varieties over an algebraically cl…
Dynamics of endomorphisms of algebraic groups
本文推广 Steinberg 不动点公式至任意光滑代数群，引入 FAD-序列公理化不动点序列，证明 Artin-Mazur zeta 函数二分法并研究周期轨道计数的素数定理类比。
Let $f \colon X \to X$ be a surjective endomorphism of a normal projective surface. When $\operatorname{deg} f \geq 2$, applying an (iteration of) $f$-equivariant minimal model program (EMMP), we determine the geometric structure of $X$. Using this, we extend the second author's result to singular surfaces to the extent that either $X$ has an $f$-invariant non-constant rational function, or $f$ has infinitely many Zariski-dense forward orbits; this result is also extended to Adelic topology (which is finer than Zariski topology).
Suppose that $K$ is a field of characteristic 0, $K_a$ is its algebraic closure, $p$ is a prime, $q=p^r$ is a power prime. Suppose that $f(x) \in K[x]$ is a polynomial of degree $n > 4$ without multiple roots. Let us consider the superelliptic curve $C: y^q=f(x)$ and its jacobian $J(C)$. We study the endomorphism algebra $End^0(J(C))$ of all $K_a$-endomorphisms of $J(C)$. We prove that $End^0(J(C))$ is "as small as possible" if the Galois group of $f$ over $K$ is either the full symmetric group $S_n$ or the alternating group $A_n$.
The study of Frobenius endomorphism provides numerous information about its corresponding Abelian variety. To understand the action of the Frobenius endomorphism, one may be interested in its eigenvalues. According to Weil's third conjecture ("Riemann hypothesis over finite fields"), they all have absolute value less than or equal to $2g\sqrt{p}$. Thus, the eigenvalues of the Frobenius endomorphism all belong to the same compact subset of the complex plane, and are roots of the same monic polynomial with integer coefficients (the characteristic polynomial of the Frobenius endomorphism). Such c…
In this paper we prove the following theorem. Let $f:\mathbb{A}^2\rightarrow \mathbb{A}^2$ be a dominate polynomial endomorphisms defined over an algebraically closed field $k$ of characteristic $0$. If there are no nonconstant rational function $g:\mathbb{A}^2-rightarrow \mathbb{P}^1$ satisfying $g\circ f=g$, then there exists a point $p\in \mathbb{A}^2(k)$ whose orbit under $f$ is Zariski dense in $\mathbb{A}^2$. This result gives us a positive answer to a conjecture of Amerik, Bogomolov and Rovinsky ( and Zhang) for polynomial endomorphisms on the affine plane.
Cyclotomic integral points for affine dynamics
本文研究了高维仿射动力学中循环积分点的性质，证明了在特定条件下正则内射的迭代可表示为代数群内射的商，并应用结果分析了后向轨道和Hénon型自同构的周期点。
In this paper, we study arithmetic dynamics in arbitrary characteristic, in particular in positive characteristic. We generalise some basic facts on arithmetic degree and canonical height in positive characteristic. As applications, we prove the dynamical Mordell-Lang conjecture for automorphisms of projective surfaces of positive entropy, the Zariski dense orbit conjecture for automorphisms of projective surfaces and for endomorphisms of projective varieties with large first dynamical degree. We also study ergodic theory for constructible topology. For example, we prove the equidistribution o…
We make explicit a construction of Serre giving a definition of an algebraic Sato-Tate group associated to an abelian variety over a number field, which is conjecturally linked to the distribution of normalized L-factors as in the usual Sato-Tate conjecture for elliptic curves. The connected part of the algebraic Sato-Tate group is closely related to the Mumford-Tate group, but the group of components carries additional arithmetic information. We then check that in many cases where the Mumford-Tate group is completely determined by the endomorphisms of the abelian variety, the algebraic Sato-T…
We discuss the Calabi--Yau type structure of normal projective surfaces and Mori dream spaces admitting a non-trivial polarized endomorphism.
Suppose K is a field of characteristic 0, $K_a$ is its algebraic closure, p is an odd prime. Suppose, $f(x) \in K[x]$ is a polynomial of degree $n \ge 5$ without multiple roots. Let us consider a curve $C: y^p=f(x)$ and its jacobian J(C). It is known that the ring End(J(C)) of all $K_a$-endomorphisms of J(C) contains the ring $Z[ζ_p]$ of integers in the pth cyclotomic field (generated by obvious automorphisms of C). We prove that $End(J(C))=Z[ζ_p]$ if the Galois group of f over K is either the symmetric group $S_n$ or the alternating group $A_n$.
Let $Φ$ be an endomorphism of $\SR(\bar{\Q})$, the projective line over the algebraic closure of $\Q$, of degree $\geq2$ defined over a number field $K$. Let $v$ be a non-archimedean valuation of $K$. We say that $Φ$ has critically good reduction at $v$ if any pair of distinct ramification points of $Φ$ do not collide under reduction modulo $v$ and the same holds for any pair of branch points. We say that $Φ$ has simple good reduction at $v$ if the map $Φ_v$, the reduction of $Φ$ modulo $v$, has the same degree of $Φ$. We prove that if $Φ$ has critically good reduction at $v$ and the reduction…
On the DML(1) property for regular endomorphisms of affine spaces: multiplicities of points at infinity
本文研究仿射空间正则自同态的动力学Mordell-Lang猜想，在无穷远点重数几何平均小于代数度的条件下，证明该猜想对曲线成立。
An abelian surface A over a field K has potential quaternionic multiplication if the ring End_\bar K (A) of geometric endomorphisms of A is an order in an indefinite rational division quaternion algebra. In this brief note, we study the possible structures of the ring of endomorphisms of these surfaces and we provide explicit examples of Jacobians of curves of genus two which show that our result is sharp.
On the dynamical degree of surjective endomorphisms
研究光滑射影曲面X上可逆有理映射f的动力学性质，探讨del Pezzo曲面中正则f的数值特征及拓扑熵计算。
Periodic curves for general endomorphisms of $\mathbb C\mathbb P^1\times \mathbb C\mathbb P^1$
研究一般有理函数迭代分解的等价性，并证明双函数内射的周期曲线存在条件
Kawaguchi-Silverman conjecture for certain surjective endomorphisms
本文证明Kawaguchi-Silverman猜想对任意射影曲面及若干高维簇（如有理连通光滑三维簇）的满射自同态成立，核心方法结合等变极小模型纲领、反典范除子有效性与环面偶对刻画。
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