Matteo Longo
We study a p-adic Shimura-Maass operator in the context of Mumford curves defined by C. Franc is his Ph.D. Thesis. We prove that this operator arises from a splitting of the Hodge filtration, thus answering a question in Franc. We also study the relation of this operator with generalized Heegner cycles, in the spirit of Bertolini-Darmon-Prasanna and Brooks.
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We give a construction of a new $p$-adic Maass-Shimura operator defined on an affinoid subdomain of the preperfectoid $p$-adic universal cover $\mathcal{Y}$ of a modular curve $Y$. We define a new notion of $p$-adic modular forms as sections of a certain sheaf $\mathcal{O}_Δ$ of "nearly rigid functions" which transform under the action of subgroups of the Galois group $\mathrm{Gal}(\mathcal{Y}/Y)$ by $\mathcal{O}_Δ^{\times}$-valued weight characters. This extends Katz's notion of $p$-adic modular forms as functions on the Igusa tower $Y^{\mathrm{Ig}}$; indeed we may recover Katz's theory by re…
Intersections of special cycles on Shimura curves and Siegel Maass forms
本文研究Shimura曲线上的特殊循环交集与Siegel Maass形式的关系，通过非全纯模形式和theta提升方法，推广了Rickards的计数结果，并给出了傅里叶系数的几何解释。
We give an explicit description of fundamental domains associated to the $p$-adic uniformisation of families of Shimura curves of discriminant $Dp$ and level $N\geq 1$, for which the one-sided ideal class number $h(D,N)$ is $1$. The obtained results generalise those in \cite[Ch. IX]{Gerritzen_vanderPut1980} for Shimura curves of discriminant $2p$ and level $N=1$. The method we present here enables us to find Mumford curves covering Shimura curves, together with a free system of generators for the associated Schottky groups, $p$-adic good fundamental domains and their stable reduction-graphs. T…
We prove the Mumford-Tate conjecture for those abelian varieties over number fields, whose simple factors of their adjoint Mumford-Tate groups have over $\dbR$ certain (products of) non-compact factors. In particular, we prove this conjecture for the orthogonal case ($B_n$ and $D_n^{\dbR}$ Shimura types). We construct embeddings of Shimura varieties of (whose adjoints are of prescribed abelian type) into unitary Shimura varieties. We also prove two general theorems involving Frobenius tori of abelian varieties over number fields.
We prove the Mumford--Tate conjecture for those abelian varieties over number fields whose extensions to C have attached adjoint Shimura varieties that are products of simple, adjoint Shimura varieties of certain Shimura types. In particular, we prove the conjecture for the orthogonal case (i.e., for the $B_n$ and $D_n^R$ Shimura types). As a main tool, we construct embeddings of Shimura varieties (whose adjoints are) of prescribed abelian type into unitary Shimura varieties of PEL type. These constructions implicitly classify the adjoints of Shimura varieties of PEL type.
Mumford-type Shimura curves contained in the Torelli locus
该研究构造了两类亏格4的Shimura曲线族的显式方程，其雅可比簇为定义在有理数域上、自同态代数为整数环且带额外Hodge张量的Mumford型阿贝尔四维簇，是该类阿贝尔簇的首批显式实例。
We study the image of $\ell$-adic representations attached to subvarieties of Shimura varieties $Sh_K(G,X)$ that are not contained in a smaller Shimura subvariety and have no isotrivial components. We show that, for $\ell$ large enough (depending on the Shimura datum $(G,X)$ and the subvariety), such image contains the $\mathbb{Z}_\ell$-points coming from the simply connected cover of the derived subgroup of $G$. This can be regarded as a geometric version of the integral $\ell$-adic Mumford-Tate conjecture.
Infinitely many supersingular primes for some Mumford's abelian fourfolds
本文将 Elkies 关于实数域上椭圆曲线超奇异素数无穷性的结果推广到 Mumford 族中的某些阿贝尔四维簇及更一般的 Kuga-Satake 阿贝尔簇族，通过研究 Hodge 型 Shimura 簇的局部形变空间和 Shimura 曲线的实点完成证明。
We show that the values of Borcherds products on Shimura varieties of orthogonal type at certain CM points are given in terms of coefficients of the holomorphic part of weight one harmonic weak Maass forms. Furthermore, we investigate the arithmetic properties of these coefficients. As an example, we obtain an analog of the Gross-Zagier theorem on singular moduli.
$p$-adic Maass--Shimura operators on $μ$-ordinary Igusa varieties
该研究针对霍奇型志村簇，将p进整近全纯自守形式上的代数马阿斯-志村微分算子扩展到μ-普通曼托万伊古萨簇，通过p进傅里叶理论等方法得到相关代数作用，扩展、澄清并恢复了先前构造。
We seek an appropriate definition for a Shimura curve of Hodge type in positive characteristics via characterizing curves in positive characteristics which are reduction of Shimura curve over $\mathbb{C}$. In this paper, we study the liftablity of a curve in the moduli space of principally polarized abelian varieties over $k, \text{char} k=p$. We show that in the generic ordinary case, some tensor decomposition of the isocrystal associated to the family imply that this curve can be lifted to a Shimura curve.
Entire theta operators at unramified primes
本文针对PEL型Shimura簇上的自守形式theta算子，实现了Maass--Shimura算子模p约化在非分歧素数处的解析延拓，构造了新型模p theta算子，并推广至任意签名与任意次数CM域。
Flipping operators and locally harmonic Maass forms
本文在适度增长调和 Maass 形式理论中引入翻转算子，并证明该算子作用于双曲型 Poincaré 级数提升得到的局部调和 Maass 形式时，同样具有使指标取反的类似性质。
Let $(G,X)$ be a Shimura pair of Hodge type such that $G$ is the Mumford--Tate group of some elements of $X$. We assume that for each simple factor $G_0$ of $G^{\ad}$ there exists a simple factor of $G_{0\dbR}$ which is compact. Let $N\Ge 3$. We show that for many compact open subgroups $K$ of $G(\dbA_f)$, the Shimura variety $\Sh(G,X)/K$ has a projective integral model $\scrN$ over $\dbZ[{1\over N}]$ which is a finite scheme over a certain Mumford moduli scheme $\scrA_{g,1,N}$. Equivalently, we show that if $A$ is an abelian variety over a number field and if the Mumford--Tate group of $A_{\d…
Non-Archimedean plectic Jacobians
本文通过高维四元数 Shimura 簇的非阿基米德一致化，为 plectic Heegner 点提供几何解释，并定义从 Mumford 簇范畴到拓扑群的 plectic 雅可比函子，推广了经典 Mumford 曲线雅可比函子。
Let $Y$ be a subvariety contained in a smooth Mumford compactification of an orthogonal Shimura variety $M \subset A_g$, where $A_g$ is the moduli space of principally polarized abelian varieties of dimension $g$ with some level structure, such that $Y$ intersects the boundary of $A_g$ transversally. Then we give necessary and sufficient conditions of André-Oort type for $Y$ itself being the compactification of a special subvariety $Y^0 \subset M$
A theorem by Mumford implies that every automorphic line bundle on a pure open Shimura variety, equipped with an invariant smooth metric, can be uniquely extended as a line bundle on a toroidal compactification of the variety, in such a way that the metric acquires only logarithmic singularities. This result is the key of being able to compute arithmetic intersection numbers from these line bundles. Hence it is natural to ask whether Mumford's result remains valid for line bundles on mixed Shimura varieties. In this paper we examine the simplest case, namely the sheaf of Jacobi forms on the un…
Generalised André-Pink-Zannier Conjecture for Shimura varieties of abelian type
本文证明了所有阿贝尔型 Shimura 簇的广义 André-Pink-Zannier 猜想，提出了适用于所有 Shimura 簇的通用命题，并证明了关于 p-adic 整数上齐次空间良好约化与 Mumford 稳定性关系的 p-adic Kempf-Ness 定理。
Unitary Friedberg--Jacquet periods and anticyclotomic p-adic L-functions
本文提出了一种高维单位ary Shimura 变种中 p-adic L-函数的构造方法，通过引入 Maass-Shimura 微分算子的 p-adic 变体，将 L-函数值与特殊循环的 p-adic 调节器联系起来。
$p$-adic monodromy and mod $p$ unlikely intersections, I
本文提出特征p下的Mumford-Tate和André-Oort猜想的类比，并通过Ax-Schanuel类型的猜想证明了这两个猜想，同时解决了Chai的Tate线性猜想。
The goal of this paper is to study certain p-adic differential operators on automorphic forms on U(n,n). These operators are a generalization to the higher-dimensional, vector-valued situation of the p-adic differential operators constructed for Hilbert modular forms by N. Katz. They are a generalization to the p-adic case of the C^{\infty}-differential operators first studied by H. Maass and later studied extensively by M. Harris and G. Shimura. The operators should be useful in the construction of certain p-adic L-functions attached to p-adic families of automorphic forms on the unitary grou…
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