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Coarsely holomorphic curves and symplectic topology 粗全形曲线与交映拓扑学
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-19 DOI: 10.1007/s00208-024-02985-8
Spencer Cattalani

A taming symplectic structure provides an upper bound on the area of an approximately pseudoholomorphic curve in terms of its homology class. We prove that, conversely, an almost complex manifold with such an area bound admits a taming symplectic structure. This confirms a speculation by Gromov. We also characterize the cone of taming symplectic structures numerically, prove that complex 2-cycles can be approximated by coarsely holomorphic curves, and provide a lower energy bound for such curves.

驯服交映结构提供了近似伪全形曲线同调类的面积上限。我们证明,反过来,具有这种面积上限的近乎复流形也承认驯服交映结构。这证实了格罗莫夫的推测。我们还从数值上描述了驯服交映结构锥的特征,证明了复 2 循环可以用粗全形曲近似,并提供了这类曲线的能量下限。
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引用次数: 0
Multifractality and intermittency in the limit evolution of polygonal vortex filaments 多边形涡旋丝极限演化中的多分形和间歇性
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-17 DOI: 10.1007/s00208-024-02971-0
Valeria Banica, Daniel Eceizabarrena, Andrea R. Nahmod, Luis Vega

With the aim of quantifying turbulent behaviors of vortex filaments, we study the multifractality and intermittency of the family of generalized Riemann’s non-differentiable functions

$$begin{aligned} R_{x_0}(t) = sum _{n ne 0} frac{e^{2pi i ( n^2 t + n x_0 ) } }{n^2}, qquad x_0 in [0,1]. end{aligned}$$

These functions represent, in a certain limit, the trajectory of regular polygonal vortex filaments that evolve according to the binormal flow. When (x_0) is rational, we show that (R_{x_0}) is multifractal and intermittent by completely determining the spectrum of singularities of (R_{x_0}) and computing the (L^p) norms of its Fourier high-pass filters, which are analogues of structure functions. We prove that (R_{x_0}) has a multifractal behavior also when (x_0) is irrational. The proofs rely on a careful design of Diophantine sets that depend on (x_0), which we study by using the Duffin–Schaeffer theorem and the Mass Transference Principle.

为了量化涡旋丝的湍流行为,我们研究了广义黎曼无差异函数$$begin{aligned}族的多重性和间歇性。R_{x_0}(t) = sum _{n ne 0} frac{e^{2pi i ( n^2 t + n x_0 ) } }{n^2}, frac{e^{2pi i ( n^2 t + n x_0 ) } }{n^2}.}{n^2}, qquad x_0 in [0,1].end{aligned}$$这些函数在一定限度内代表了根据二正态流演化的规则多边形涡旋丝的轨迹。当 (x_0) 是有理数时,我们通过完全确定 (R_{x_0}) 的奇点谱并计算其傅里叶高通滤波器的 (L^p) 准则(它们是结构函数的类似物),证明 (R_{x_0}) 是多分形和间歇的。我们证明了当(x_0)是无理数时,(R_{x_0})也具有多分形行为。证明依赖于对依赖于 (x_0) 的 Diophantine 集的精心设计,我们利用 Duffin-Schaeffer 定理和质量转移原理对其进行了研究。
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引用次数: 0
On the uniqueness of periodic solutions for a Rayleigh–Liénard system with impulses 论带脉冲的 Rayleigh-Liénard 系统周期解的唯一性
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-17 DOI: 10.1007/s00208-024-02996-5
Hebai Chen, Jie Jin, Zhaoxia Wang, Dongmei Xiao

This paper is to provide a criterion of the uniqueness of periodic solutions for a Rayleigh-Liénard system with state-dependent impulses. Notice that such results of a planar system with state-dependent impulses are few. Moreover, the Rayleigh-Liénard system with state-dependent impulses has wide applications, such as a simple pendulum and a spring vibrator. Further, we obtain the uniqueness of periodic solutions of the simple pendulum with state-dependent impulses and the spring vibrator with state-dependent impulses by the criterion.

本文旨在为具有状态相关脉冲的 Rayleigh-Liénard 系统提供周期解的唯一性准则。我们注意到,具有状态相关脉冲的平面系统的此类结果很少。此外,与状态相关脉冲的雷利-李纳系统应用广泛,如简单摆和弹簧振动器。此外,我们还通过判据得到了具有状态相关脉冲的简摆和具有状态相关脉冲的弹簧振子的周期解的唯一性。
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引用次数: 0
Uniformly super McDuff $$hbox {II}_1$$ factors 统一超麦克杜夫 $$hbox {II}_1$$ 因子
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-12 DOI: 10.1007/s00208-024-02959-w
Isaac Goldbring, David Jekel, Srivatsav Kunnawalkam Elayavalli, Jennifer Pi

We introduce and study the family of uniformly super McDuff (hbox {II}_1) factors. This family is shown to be closed under elementary equivalence and also coincides with the family of (hbox {II}_1) factors with the Brown property introduced in Atkinson et al. (Adv. Math. 396, 108107, 2022). We show that a certain family of existentially closed factors, the so-called infinitely generic factors, are uniformly super McDuff, thereby improving a recent result of Chifan et al. (Embedding Universality for (hbox {II}_1) Factors with Property (T). arXiv preprint, 2022). We also show that Popa’s family of strongly McDuff (hbox {II}_1) factors are uniformly super McDuff. Lastly, we investigate when finitely generic (hbox {II}_1) factors are uniformly super McDuff.

我们介绍并研究了均匀超麦克杜夫(hbox {II}_1)因子族。这个族被证明在基本等价下是封闭的,并且与阿特金森等人(Adv. Math. 396, 108107, 2022)中介绍的具有布朗性质的 (hbox {II}_1) 因子的族重合。我们证明了存在封闭因子的某个族,即所谓的无限泛函因子,是均匀超麦克达夫的,从而改进了奇凡等人最近的一个结果(Embedding Universality for (hbox {II}_1) Factors with Property (T). arXiv preprint, 2022)。我们还证明了 Popa 的强 McDuff (hbox {II}_1)因子族是均匀超 McDuff 的。最后,我们研究了有限泛函(hbox {II}_1)因子是均匀超级麦克达夫的情况。
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引用次数: 0
Normalized solutions for Kirchhoff equations with Sobolev critical exponent and mixed nonlinearities 具有索波列夫临界指数和混合非线性的基尔霍夫方程的归一化解
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-12 DOI: 10.1007/s00208-024-02982-x
Sitong Chen, Xianhua Tang

This paper focuses on the existence of normalized solutions for the following Kirchhoff equation:

$$begin{aligned} left{ begin{array}{ll} -left( a+bint _{{mathbb {R}}^3}|nabla u|^2textrm{d}xright) Delta u+lambda u=u^5+mu |u|^{q-2}u, & xin {mathbb {R}}^3, int _{{mathbb {R}}^3}u^2textrm{d}x=c, end{array} right. end{aligned}$$

where (a,b,c>0), (mu in {mathbb {R}}) and (2<q<6), (lambda in {mathbb {R}}) will arise as a Lagrange multiplier that is not a priori given. By using new analytical techniques, the paper establishes several existence results for the case (mu >0):

  1. (1)

    The existence of two solutions, one being a local minimizer and the other of mountain-pass type, under explicit conditions on c when (2<q<frac{10}{3}).

  2. (2)

    The existence of a mountain-pass type solution under explicit conditions on c when (frac{10}{3}le q<frac{14}{3}).

  3. (3)

    The existence of a ground state solution for all (c>0) when (frac{14}{3}le q<6).

Furthermore, the paper presents the first non-existence result for the case (mu le 0) and (2<q<6). In particular, refined estimates of energy levels are proposed, suggesting a new threshold of compactness in the (L^2)-constraint. This study addresses an open problem for (2<q<frac{10}{3}) and fills a gap in the case (frac{10}{3}le q<frac{14}{3}). We believe that our approach can be applied to a broader range of nonlinear terms with Sobolev critical growth, and the underlying ideas have potential for future development and applicability.

本文重点研究以下基尔霍夫方程的归一化解的存在性: $$begin{aligned}left( a+bint _{{mathbb {R}}^3}|nabla u|^2textrm{d}xright) Delta u+lambda u=u^5+mu |u|^{q-2}u, &;xin {mathbb {R}}^3, int _{mathbb {R}}^3}u^2textrm{d}x=c, end{array}.对end{aligned}$where (a,b,c>0), (mu in {mathbb {R}}) and (2<q<6), (lambda in {mathbb {R}}) will arise as a Lagrange multiplier that is not a priori given.通过使用新的分析技术,本文为 (mu >0) 的情况建立了几个存在性结果:(1)当 (2<q<frac{10}{3})时,在 c 的显式条件下存在两个解,一个是局部最小解,另一个是山路类型的解。(2)当(frac{10}{3}le q<frac{14}{3}) 时,在c的显式条件下存在一个山越式解。 (3)当(frac{14}{3}le q<6) 时,对于所有(c>0)存在一个基态解。此外,本文首次提出了(mu le 0) and(2<q<6) 情况下的不存在结果。特别是提出了对能级的精细估计,暗示了在(L^2)约束下紧凑性的新阈值。这项研究解决了 (2<q<frac{10}{3}) 的一个未决问题,并填补了 (frac{10}{3}le q<frac{14}{3}) 情况下的一个空白。我们相信,我们的方法可以应用于范围更广的具有索博列夫临界增长的非线性项,其基本思想具有未来发展和应用的潜力。
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引用次数: 0
Gaussian estimates vs. elliptic regularity on open sets 开放集上的高斯估计与椭圆正则性
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-10 DOI: 10.1007/s00208-024-02939-0
Tim Böhnlein, Simone Ciani, Moritz Egert

Given an elliptic operator (L= - {{,textrm{div},}}(A nabla cdot )) subject to mixed boundary conditions on an open subset of (mathbb {R}^d), we study the relation between Gaussian pointwise estimates for the kernel of the associated heat semigroup, Hölder continuity of L-harmonic functions and the growth of the Dirichlet energy. To this end, we generalize an equivalence theorem of Auscher and Tchamitchian to the case of mixed boundary conditions and to open sets far beyond Lipschitz domains. Yet, we prove the consistency of our abstract result by encompassing operators with real-valued coefficients and their small complex perturbations into one of the aforementioned equivalent properties. The resulting kernel bounds open the door for developing a harmonic analysis for the associated semigroups on rough open sets.

给定椭圆算子 (L= - {{,textrm{div},}}(A nabla cdot )) 在 (mathbb {R}^d)的开放子集上受混合边界条件约束,我们研究相关热半群内核的高斯点估计、L谐函数的霍尔德连续性和德里赫特能量增长之间的关系。为此,我们将 Auscher 和 Tchamitchian 的等价定理推广到混合边界条件的情况以及远超过 Lipschitz 域的开放集。然而,通过将具有实值系数的算子及其微小的复扰动纳入上述等价性质之一,我们证明了抽象结果的一致性。由此得出的内核边界为发展粗糙开集上相关半群的谐波分析打开了大门。
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引用次数: 0
Radial symmetry and sharp asymptotic behaviors of nonnegative solutions to $$D^{1,p}$$ -critical quasi-linear static Schrödinger–Hartree equation involving p-Laplacian $$-Delta _{p}$$ 涉及 p-Laplacian $$-Delta _{p}$$ 的 $$D^{1,p}$ 临界准线性静态薛定谔-哈特里方程的非负解的径向对称性和尖锐渐近行为
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-09 DOI: 10.1007/s00208-024-02986-7
Wei Dai, Yafei Li, Zhao Liu

In this paper, we mainly consider nonnegative weak solution to the (D^{1,p}(mathbb {R}^{N}))-critical quasi-linear static Schrödinger–Hartree equation with p-Laplacian (-Delta _{p}) and nonlocal nonlinearity:

$$begin{aligned} -Delta _p u =left( |x|^{-2p}*|u|^{p}right) |u|^{p-2}u qquad&text{ in } ,, mathbb {R}^N, end{aligned}$$

where (1<p<frac{N}{2}), (Nge 3) and (uin D^{1,p}(mathbb {R}^N)). First, we establish regularity and the sharp estimates on asymptotic behaviors for any positive solution u (and (|nabla u|)) to more general equation (-Delta _p u=V(x)u^{p-1}) with (Vin L^{frac{N}{p}}(mathbb {R}^{N})). Then, as a consequence, we can apply the method of moving planes to prove that all the nontrivial nonnegative solutions are radially symmetric and strictly decreasing about some point (x_0in mathbb {R}^N). The radial symmetry and sharp asymptotic estimates for more general nonlocal quasi-linear equations were also included.

在本文中,我们主要考虑具有 p-拉普拉斯(-Delta _{p})和非局部非线性的 (D^{1,p}(mathbb {R}^{N}))-critical 准线性静态薛定谔-哈特里方程的非负弱解:$$begin{aligned} -Delta _p u =left( |x|^{-2p}*|u|^{p}right) |u|^{p-2}u qquad&text{ in },,mathbb{R}^N,end{aligned}$$其中(1<p<frac{N}{2}),(N/ge 3) and(uin D^{1,p}(mathbb {R}^N)).首先,我们为更一般的方程 (-Delta _p u=V(x)u^{p-1}) with (Vin L^{frac{N}{p}}(mathbb {R}^{N}))的任何正解 u(和 (|nabla u|))建立正则性和渐近行为的尖锐估计。因此,我们可以应用平面移动的方法来证明所有非小非负解都是径向对称的,并且严格围绕某个点 (x_0in mathbb {R}^{N) 递减。还包括更一般的非局部准线性方程的径向对称性和尖锐渐近估计。
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引用次数: 0
Rigid comparison geometry for Riemannian bands and open incomplete manifolds 黎曼带和开放不完全流形的刚性比较几何
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-05 DOI: 10.1007/s00208-024-02973-y
Sven Hirsch, Demetre Kazaras, Marcus Khuri, Yiyue Zhang

Comparison theorems are foundational to our understanding of the geometric features implied by various curvature constraints. This paper considers manifolds with a positive lower bound on either scalar, 2-Ricci, or Ricci curvature, and contains a variety of theorems which provide sharp relationships between this bound and notions of width. Some inequalities leverage geometric quantities such as boundary mean curvature, while others involve topological conditions in the form of linking requirements or homological constraints. In several of these results open and incomplete manifolds are studied, one of which partially addresses a conjecture of Gromov in this setting. The majority of results are accompanied by rigidity statements which isolate various model geometries—both complete and incomplete—including a new characterization of round lens spaces, and other models that have not appeared elsewhere. As a byproduct, we additionally give new and quantitative proofs of several classical comparison statements such as Bonnet-Myers’ and Frankel’s Theorem, as well as a version of Llarull’s Theorem and a notable fact concerning asymptotically flat manifolds. The results that we present vary significantly in character, however a common theme is present in that the lead role in each proof is played by spacetime harmonic functions, which are solutions to a certain elliptic equation originally designed to study mass in mathematical general relativity.

比较定理是我们理解各种曲率约束所隐含的几何特征的基础。本文考虑了对标量曲率、2-Ricci 或 Ricci 曲率具有正下限的流形,并包含各种定理,这些定理提供了该下限与宽度概念之间的尖锐关系。一些不等式利用了诸如边界平均曲率等几何量,而另一些不等式则以链接要求或同调约束的形式涉及拓扑条件。在这些结果中,有几个研究了开放流形和不完全流形,其中一个结果部分解决了格罗莫夫在这种情况下的一个猜想。大多数结果都附有刚度声明,这些声明孤立了各种模型几何--包括完全和不完全--包括圆透镜空间的新表征,以及其他地方未曾出现过的模型。作为副产品,我们还给出了一些经典比较声明的新定量证明,如邦奈-迈尔斯定理和弗兰克尔定理,以及拉鲁尔定理的一个版本和关于渐平流形的一个显著事实。我们提出的结果在性质上有很大不同,但有一个共同的主题,即每个证明的主角都是时空谐函数,它们是某个椭圆方程的解,最初是为了研究数学广义相对论中的质量而设计的。
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引用次数: 0
Extensions of k-regulous functions from two-dimensional varieties 来自二维变体的 k-regulous 函数的扩展
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-03 DOI: 10.1007/s00208-024-02981-y
Juliusz Banecki

We prove that a k-regulous function defined on a two-dimensional non-singular affine variety can be extended to an ambient variety. Additionally we derive some results concerning sums of squares of k-regulous functions; in particular we show that every positive semi-definite regular function on a non-singular affine variety can be written as a sum of squares of locally Lipschitz regulous functions.

我们证明了定义在二维非星形仿射变上的 k-regulous 函数可以扩展到环境变上。此外,我们还推导出了一些有关 k-regulous 函数平方和的结果;特别是,我们证明了非星形仿射变上的每个正半定常函数都可以写成局部 Lipschitz regulous 函数的平方和。
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引用次数: 0
On neighborhoods of embedded complex tori 关于内嵌复杂环的邻域
IF 1.4 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-03 DOI: 10.1007/s00208-024-02975-w
Xianghong Gong, Laurent Stolovitch

The goal of the article is to show that an n-dimensional complex torus embedded in a complex manifold of dimensional (n+d), with a split tangent bundle, has a neighborhood biholomorphic to a neighborhood of the zero section in its normal bundle, provided the latter has locally constant and diagonalizable transition functions and satisfies a non-resonant Diophantine condition.

文章的目的是证明,一个嵌入维数为(n+d)的复流形中的n维复环有一个分裂的切线束,只要后者有局部恒定和可对角的过渡函数,并满足一个非共振的狄奥芬条件,那么它就有一个与其法线束中零段邻域双全形的邻域。
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引用次数: 0
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Mathematische Annalen
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