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Thin Monodromy in (textrm{O}(5)) Thin Monodromy in (textrm{O}(5))
IF 0.5 Q3 MATHEMATICS Pub Date : 2024-03-25 DOI: 10.1007/s40316-024-00222-x
Jitendra Bajpai, Martin Nitsche

This article studies the orthogonal hypergeometric groups of degree five. We establish the thinness of 12 out of the 19 hypergeometric groups of type O(3, 2) from [4, Table 6]. Some of these examples are associated with Calabi-Yau 4-folds. We also establish the thinness of 9 out of the 17 hypergeometric groups of type O(4, 1) from [13], where the thinness of 7 other cases was already proven. The O(4, 1) type groups were predicted to be all thin and our result leaves just one case open.

本文研究五度正交超几何群。我们确定了 [4, 表 6] 中 19 个 O(3, 2) 型超几何群中 12 个群的稀疏性。其中一些例子与 Calabi-Yau 4 折叠相关。我们还证明了 [13] 中 17 个 O(4, 1) 型超几何群中 9 个群的稀疏性,其中 7 个群的稀疏性已经被证明。O(4, 1) 型超几何群被预测为全部稀疏,而我们的结果只留下了一种情况。
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引用次数: 0
Some stability results of positive mass theorem for uniformly asymptotically flat 3-manifolds 均匀渐近平坦 3-manifolds 的正质量定理的若干稳定性结果
IF 0.5 Q3 MATHEMATICS Pub Date : 2024-03-14 DOI: 10.1007/s40316-024-00226-7
Conghan Dong

In this paper, we show that for a sequence of orientable complete uniformly asymptotically flat 3-manifolds ((M_i, g_i)) with nonnegative scalar curvature and ADM mass (m(g_i)) tending to zero, by subtracting some open subsets (Z_i), whose boundary area satisfies (textrm{Area}(partial Z_i) le C m(g_i)^{frac{1}{2}- varepsilon }), for any base point (p_i in M_i{setminus } Z_i), ((M_i{setminus } Z_i, g_i, p_i)) converges to the Euclidean space (({mathbb {R}}^3, g_E, 0)) in the (C^0) modulo negligible volume sense. Moreover, if we assume that the Ricci curvature is uniformly bounded from below, then ((M_i, g_i, p_i)) converges to (({mathbb {R}}^3, g_E, 0)) in the pointed Gromov–Hausdorff topology.

在本文中,我们证明了对于具有非负标量曲率和趋于零的 ADM 质量 (m(g_i))的可定向完整均匀渐近平坦 3-manifolds((M_i, g_i))序列,通过减去一些开放子集 (Z_i)、对于任何基点 (p_i in M_i{setminus } Z_i) 来说,其边界面积满足 (textrm{Area}(partial Z_i) le C m(g_i)^{frac{1}{2}- varepsilon })、((M_i{setminus}Z_i, g_i, p_i)) 收敛到欧几里得空间 (({mathbb {R}}^3, g_E, 0)) 在 (C^0) modulo negligible volume 的意义上。此外,如果我们假设里奇曲率从下往上是均匀有界的,那么在尖的格罗莫夫-豪斯多夫拓扑中,((M_i, g_i, p_i))收敛于({mathbb {R}}^3, g_E, 0))。
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引用次数: 0
Sharp upper bounds for Steklov eigenvalues of a hypersurface of revolution with two boundary components in Euclidean space 欧几里得空间中具有两个边界分量的旋转超曲面的斯特克洛夫特征值的尖锐上限
IF 0.5 Q3 MATHEMATICS Pub Date : 2024-03-06 DOI: 10.1007/s40316-024-00225-8
Léonard Tschanz

We investigate the question of sharp upper bounds for the Steklov eigenvalues of a hypersurface of revolution in Euclidean space with two boundary components, each isometric to ({mathbb {S}}^{n-1}). For the case of the first non zero Steklov eigenvalue, we give a sharp upper bound (B_n(L)) (that depends only on the dimension (n ge 3) and the meridian length (L>0)) which is reached by a degenerated metric (g^*) that we compute explicitly. We also give a sharp upper bound (B_n) which depends only on n. Our method also permits us to prove some stability properties of these upper bounds.

我们研究了欧几里得空间中具有两个边界分量的旋转超曲面的斯特克洛夫特征值的尖锐上界问题,每个边界分量都与({mathbb {S}}^{n-1}) 等距。对于第一个非零斯特克洛夫特征值的情况,我们给出了一个尖锐的上界(B_n(L))(仅取决于维度(n ge 3) 和子午线长度(L>0)),这个上界是通过我们明确计算的退化度量(g^*)达到的。我们还给出了一个仅取决于 n 的尖锐上界 (B_n)。我们的方法还允许我们证明这些上界的一些稳定性。
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引用次数: 0
Growth rates of Laplace eigenfunctions on the unit disk 单位圆盘上拉普拉斯本征函数的增长率
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-08-03 DOI: 10.1007/s40316-023-00219-y
Guillaume Lavoie, Guillaume Poliquin

We give a description of the growth rates of (L^2)-normalized Laplace eigenfunctions on the unit disk with Dirichlet and Neumann boundary conditions. In particular, we show that the growth rates of both Dirichlet and Neumann eigenfunctions are bounded away from zero. Our approach starts with P. Sarnak growth exponents and uses several key asymptotic formulas for Bessel functions or their zeros.

我们描述了单位圆盘上具有迪里夏特和诺伊曼边界条件的 (L^2)-normalized Laplace 特征函数的增长率。特别是,我们证明了狄利克特和诺伊曼特征函数的增长率都是有界的,远离零。我们的方法始于 P. Sarnak 增长指数,并使用了贝塞尔函数或其零点的几个关键渐近公式。
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引用次数: 0
On the group of (omega ^{k})-preserving diffeomorphisms 关于保留微分同胚的$$omega^{k}$$群
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-08-02 DOI: 10.1007/s40316-023-00220-5
Habib Alizadeh

We show that if a diffeomorphism of a symplectic manifold ((M^{2n},omega )) preserves the form (omega ^{k}) for (0< k < n) and is connected to identity through such diffeomorphisms then it is indeed a symplectomorphism.

我们证明,如果交映流形 ((M^{2n},omega )) 的衍射在 (0< k < n) 时保留了 (omega ^{k}) 的形式,并且通过这样的衍射与同一性相连,那么它确实是一个交映流形。
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引用次数: 0
A formal model of Coleman families and applications to Iwasawa invariants Coleman族的形式模型及其在Iwasawa不变量中的应用
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-07-06 DOI: 10.1007/s40316-023-00217-0
Filippo Alberto Edoardo Nuccio Mortarino Majno di Capriglio, Tadashi Ochiai, Jishnu Ray

For a given Coleman family of modular forms, we construct a formal model and prove the existence of a family of Galois representations associated to the Coleman family. As an application, we study the variations of Iwasawa (lambda )- and (mu )-invariants of dual fine (strict) Selmer groups over the cyclotomic (mathbb {Z}_p)-extension of (mathbb {Q}) in Coleman families of modular forms. This generalizes an earlier work of Jha and Sujatha for Hida families.

对于给定模块形式的科尔曼族,我们构建了一个形式模型,并证明了与科尔曼族相关的伽罗瓦表示族的存在。作为应用,我们研究了在模块形式的科尔曼族中(mathbb {Q})的循环(mathbb {Z}_p)-extension of (mathbb {Q})上的对偶精细(严格)塞尔默群的岩沢(lambda)-和(mu)-不变量的变化。这概括了 Jha 和 Sujatha 早期针对希达族的工作。
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引用次数: 0
La matrice de logarithme en termes de chiffres p-adiques 以 p-adic 数表示的对数矩阵
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-06-21 DOI: 10.1007/s40316-023-00215-2
Florian Sprung

We give a new description of the logarithm matrix of a modular form in terms of distributions, generalizing the work of Dion and Lei for the case (a_p=0). What allows us to include the case (a_pne 0) is a new definition, that of a distribution matrix, and the characterization of this matrix by p-adic digits. One can apply these methods to the corresponding case of distributions in multiple variables.

我们用分布给出了模块形式对数矩阵的新描述,推广了迪昂和雷针对 (a_p=0) 情况所做的工作。使我们能够包含 (a_pne 0) 情况的是一个新的定义,即分布矩阵,以及用 p-adic 数描述这个矩阵。我们可以把这些方法应用于多变量分布的相应情况。
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引用次数: 0
Optimal bounds for Neumann eigenvalues in terms of the diameter 以直径表示的诺伊曼特征值的最优界
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-06-10 DOI: 10.1007/s40316-023-00218-z
Antoine Henrot, Marco Michetti

In this paper, we obtain optimal upper bounds for all the Neumann eigenvalues in two situations (that are closely related). First we consider a one-dimensional Sturm–Liouville eigenvalue problem where the density is a function h(x) whose some power is concave. We prove existence of a maximizer for (mu _k(h)) and we completely characterize it. Then we consider the Neumann eigenvalues (for the Laplacian) of a domain (Omega subset {mathbb {R}}^d) of given diameter and we assume that its profile function (defined as the (d-1) dimensional measure of the slices orthogonal to a diameter) has also some power that is concave. This includes the case of convex domains in ({mathbb {R}}^d), containing and generalizing previous results by P. Kröger. On the other hand, in the last section, we give examples of domains for which the upper bound fails to be true, showing that, in general, (sup D^2(Omega )mu _k(Omega )= +infty ).

在本文中,我们在两种(密切相关的)情况下获得了所有诺伊曼特征值的最优上限。首先,我们考虑一个一维 Sturm-Liouville 特征值问题,其中的密度是一个函数 h(x),它的某个幂是凹的。我们证明了 (mu _k(h)) 最大化的存在,并完全描述了它的特征。然后我们考虑给定直径的域(Omega subset {mathbb {R}}^d) 的诺伊曼特征值(对于拉普拉斯),我们假设它的轮廓函数(定义为与直径正交的切片的(d-1) 维度量)也有一些幂是凹的。这包括了 ({mathbb {R}}^d) 中凸域的情况,包含并推广了 P. Kröger 以前的结果。另一方面,在最后一节中,我们举例说明了上界不成立的域,表明在一般情况下,(sup D^2(Omega )mu _k(Omega )= +infty )。
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引用次数: 0
Higher codimension Iwasawa theory for elliptic curves with supersingular reduction 超奇异约化椭圆曲线的高协维Iwasawa理论
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-05-15 DOI: 10.1007/s40316-023-00216-1
Takenori Kataoka

Bleher et al. began studying higher codimension Iwasawa theory for classical Iwasawa modules. Subsequently, Lei and Palvannan studied an analogue for elliptic curves with supersingular reduction. In this paper, we obtain a vast generalization of the work of Lei and Palvannan. A key technique is an approach to the work of Bleher et al. that the author previously proposed. For this purpose, we also study the structure of ±-norm subgroups and duality properties of multiply-signed Selmer groups.

Bleher 等人开始研究经典岩泽模块的高标度岩泽理论。随后,Lei 和 Palvannan 研究了椭圆曲线的类似理论。在本文中,我们对 Lei 和 Palvannan 的研究成果进行了广泛的推广。其中的关键技术是作者之前提出的对 Bleher 等人工作的一种方法。为此,我们还研究了±规范子群的结构和多符号塞尔默群的对偶性。
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引用次数: 0
Ramification of p-power torsion points of formal groups 形式群的p-幂扭点的分支
IF 0.5 Q3 MATHEMATICS Pub Date : 2023-05-11 DOI: 10.1007/s40316-023-00214-3
Adrian Iovita, Jackson S. Morrow, Alexandru Zaharescu

Let p be a rational prime, let F denote a finite, unramified extension of (mathbb {Q}_p), let K be the completion of the maximal unramified extension of (mathbb {Q}_p), and let (overline{K}) be some fixed algebraic closure of K. Let A be an abelian variety defined over F, with good reduction, let (mathcal {A}) denote the Néron model of A over (textrm{Spec}(mathcal {O}_F)), and let (widehat{mathcal {A}}) be the formal completion of (mathcal {A}) along the identity of its special fiber, i.e. the formal group of A. In this work, we prove two results concerning the ramification of p-power torsion points on (widehat{mathcal {A}}). One of our main results describes conditions on (widehat{mathcal {A}}), base changed to (text {Spf}(mathcal {O}_K) ), for which the field (K(widehat{mathcal {A}}[p])/K) i s a tamely ramified extension where (widehat{mathcal {A}}[p]) denotes the group of p-torsion points of (widehat{mathcal {A}}) over (mathcal {O}_{overline{K}}). This result generalizes previous work when A is 1-dimensional and work of Arias-de-Reyna when A is the Jacobian of certain genus 2 hyperelliptic curves.

让 p 是一个有理素数,让 F 表示 (mathbb {Q}_p) 的一个有限的、未精简的扩展,让 K 是 (mathbb {Q}_p) 的最大未精简扩展的完成,让 (overline{K}) 是 K 的某个固定代数闭包。让 A 是一个定义在 F 上的无常花序,具有良好的还原性,让 (mathcal {A}) 表示 A 在 (textrm{Spec}(mathcal {O}_F)) 上的内龙模型,让 (widehatmathcal {A}) 是 (mathcal {A}) 沿其特殊纤维的同一性的形式完成,即 A 的形式群。在这项工作中,我们证明了两个关于 (widehat{mathcal {A}}) 上 p-power 扭转点的ramification 的结果。我们的主要结果之一描述了在(widehat{mathcal {A}}), base changed to (text {Spf}(mathcal {O}_K) )上的条件、对它来说,场 (K(widehatmathcal {A}[p])/K) 是一个驯服的分支,其中 (widehatmathcal {A}[p]) 表示 (widehatmathcal {A}) 在 (mathcal {O}_{overline{K}}) 上的 p 个扭转点群。这一结果概括了之前在 A 是一维时的工作,以及 Arias-de-Reyna 在 A 是某些属 2 超椭圆曲线的雅各布时的工作。
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Annales Mathematiques du Quebec
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