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Derived categories of symmetric products and moduli spaces of vector bundles on a curve 曲线上向量束的对称积和模空间的导出范畴
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-05-01 Epub Date: 2025-02-24 DOI: 10.1016/j.matpur.2025.103694
Kyoung-Seog Lee , Han-Bom Moon
We show that the derived categories of symmetric products of a curve are embedded into the derived categories of the moduli spaces of vector bundles of large ranks on the curve. It supports a prediction of the existence of a semiorthogonal decomposition of the derived category of the moduli space, expected by a motivic computation. As an application, we show that all Jacobian varieties, symmetric products of curves, and all principally polarized abelian varieties of dimension at most three, are Fano visitors. We also obtain similar results for motives.
我们证明了曲线对称积的派生范畴嵌入到曲线上大秩向量束的模空间的派生范畴中。它支持对模空间的派生范畴的半正交分解存在性的预测,这是由一个动机计算所期望的。作为一个应用,我们证明了所有雅可比矩阵、曲线的对称积和所有不超过3维的主极化阿贝尔变换都是Fano访客。对于动机,我们也得到了类似的结果。
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引用次数: 0
Four-dimensional gradient Ricci solitons with (half) nonnegative isotropic curvature 具有(半)非负各向同性曲率的四维梯度里奇孤子
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-05-01 Epub Date: 2025-02-24 DOI: 10.1016/j.matpur.2025.103686
Huai-Dong Cao , Junming Xie
This is a sequel to our paper [24], in which we investigated the geometry of 4-dimensional gradient shrinking Ricci solitons with half positive (nonnegative) isotropic curvature. In this paper, we mainly focus on 4-dimensional gradient steady Ricci solitons with nonnegative isotropic curvature (WPIC) or half nonnegative isotropic curvature (half WPIC). In particular, for 4D complete ancient solutions with WPIC, we are able to prove the 2-nonnegativity of the Ricci curvature and bound the curvature tensor Rm by |Rm|R. For 4D gradient steady solitons with WPIC, we obtain a classification result. We also give a partial classification of 4D gradient steady Ricci solitons with half WPIC. Moreover, we obtain a preliminary classification result for 4D complete gradient expanding Ricci solitons with WPIC. Finally, motivated by the recent work [59], we improve our earlier results in [24] on 4D gradient shrinking Ricci solitons with half PIC or half WPIC, and also provide a characterization of complete gradient Kähler-Ricci shrinkers in complex dimension two among 4-dimensional gradient Ricci shrinkers.
这是我们论文[24]的续集,在[24]中,我们研究了具有半正(非负)各向同性曲率的四维梯度收缩Ricci孤子的几何。本文主要研究具有非负各向同性曲率(WPIC)或半非负各向同性曲率(half non - anisotropic curvature, WPIC)的四维梯度稳定Ricci孤子。特别是对于具有WPIC的4D完全古解,我们证明了Ricci曲率的2-非负性,并将曲率张量Rm限定为|Rm|≤R。对于具有WPIC的四维梯度稳定孤子,我们得到了一个分类结果。给出了具有半WPIC的四维梯度稳定Ricci孤子的部分分类。此外,我们还利用WPIC获得了4D完全梯度展开Ricci孤子的初步分类结果。最后,在最近工作[59]的激励下,我们改进了[24]中关于半PIC或半WPIC的4D梯度收缩Ricci孤子的早期结果,并在4维梯度Ricci收缩子中给出了复二维完全梯度Kähler-Ricci收缩子的表征。
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引用次数: 0
Reconstruction along a geodesic from sphere data in Finsler geometry and anisotropic elasticity 基于Finsler几何和各向异性弹性的球面数据沿测地线重建
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-04-01 Epub Date: 2025-02-24 DOI: 10.1016/j.matpur.2025.103688
Maarten V. de Hoop , Joonas Ilmavirta , Matti Lassas
Dix formulated the inverse problem of recovering an elastic body from the measurements of wave fronts of point sources. We geometrize this problem in the context of seismology, leading to the geometrical inverse problem of recovering a Finsler manifold from certain sphere data in a given open subset of the manifold. We solve this problem locally along any geodesic through the measurement set.
Dix提出了从点源波前测量中恢复弹性体的反问题。我们在地震学的背景下将这个问题几何化,导致从给定的开放子集的某些球体数据中恢复芬斯勒流形的几何逆问题。我们通过测量集沿任意测地线局部求解这个问题。
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引用次数: 0
Commutator type and Levi type of a system of CR vector fields CR矢量场系统的换向子型和李维型
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-04-01 Epub Date: 2025-02-24 DOI: 10.1016/j.matpur.2025.103693
Xiaojun Huang , Wanke Yin
Let M be a smooth pseudoconvex real hypersurface in Cn with n2 and let B be a subbundle of the CR tangent vector bundle of M. We prove that the commutator type and the Levi type associated with B are the same when either of them is less than 8. When the Levi type is eight or larger, we show that it is bounded from above by twice of the commutator type minus 8. Our results provide a partial solution to a generalized conjecture of D'Angelo.
设M为Cn中n≥2的光滑伪凸实超曲面,设B为M的CR切向量束的一子束,证明了B的换易子型与Levi型在任意一个小于8时是相同的。当Levi类型为8或更大时,我们证明它从上面以换易子类型的两倍减去8为界。我们的结果提供了D’angelo广义猜想的部分解。
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引用次数: 0
Frequency-domain criterion on the stabilizability for infinite-dimensional linear control systems 无穷维线性控制系统稳定性的频域判据
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-04-01 Epub Date: 2025-02-24 DOI: 10.1016/j.matpur.2025.103690
Karl Kunisch , Gengsheng Wang , Huaiqiang Yu
A quantitative frequency-domain condition related to the exponential stabilizability for infinite-dimensional linear control systems is presented. It is proven that this condition is necessary and sufficient for the stabilizability of special systems, while it is a necessary condition for the stabilizability in general. Applications are provided.
给出了无限维线性控制系统指数稳定性的一个定量频域条件。证明了该条件对于特殊系统的稳定性是充分必要条件,而对于一般系统的稳定性是必要条件。提供了应用程序。
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引用次数: 0
Damping for fractional wave equations and applications to water waves 分数波方程的阻尼及其在水波中的应用
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-04-01 Epub Date: 2025-02-24 DOI: 10.1016/j.matpur.2025.103692
Thomas Alazard , Jeremy L. Marzuola , Jian Wang
Motivated by numerically modeling surface waves for inviscid Euler equations, we analyze linear models for damped water waves and establish decay properties for the energy for sufficiently regular initial configurations. Our findings give the explicit decay rates for the energy, but do not address reflection/transmission of waves at the interface of the damping. Still for a subset of the models considered, this represents the first result proving the decay of the energy of the surface wave models.
通过对无粘欧拉方程的表面波进行数值模拟,我们分析了阻尼水波的线性模型,并建立了足够规则的初始构型的能量衰减特性。我们的研究结果给出了能量的明确衰减率,但没有解决阻尼界面处波的反射/透射问题。对于所考虑的模型的一个子集,这代表了第一个证明表面波模型能量衰减的结果。
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引用次数: 0
A geometric characterization of toric singularities 环面奇点的几何表征
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-03-01 Epub Date: 2024-11-04 DOI: 10.1016/j.matpur.2024.103620
Joaquin Moraga , Roberto Svaldi
Given a projective contraction π:XZ and a log canonical pair (X,B) such that (KX+B) is nef over a neighborhood of a closed point zZ, one can define an invariant, the complexity of (X,B) over zZ, comparing the dimension of X and the relative Picard number of X/Z with the sum of the coefficients of those components of B intersecting the fiber over z. We prove that, in the hypotheses above, the complexity of the log pair (X,B) over zZ is non-negative and that when it is zero then (X,B)Z is formally isomorphic to a morphism of toric varieties around zZ. In particular, considering the case when π is the identity morphism, we get a geometric characterization of singularities that are formally isomorphic to toric singularities, thus resolving a conjecture due to Shokurov.
给定一个射影收缩π:X→Z和一个对数正则对(X,B),使得- (KX+B)在闭点Z∈Z的邻域上是nef,我们可以定义一个不变量,即(X,B)在Z∈Z上的复杂度,将X的维数和X/Z的相对Picard数与B在Z上与纤维相交的那些分量的系数之和进行比较。我们证明,在上面的假设中,对数对(X,B)在z∈z上的复杂度是非负的,当其为零时,则(X,⌊B⌋)→z在形式上同构于z∈z周围的环变体的态射。特别地,考虑π是恒等态射的情况,我们得到了形式上同构于环奇点的奇点的几何刻画,从而解决了一个由Shokurov引起的猜想。
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引用次数: 0
Construction of weak solutions to a model of pressureless viscous flow driven by nonlocal attraction–repulsion 非局部吸引-排斥驱动无压粘性流动模型弱解的构造
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-03-01 Epub Date: 2025-01-15 DOI: 10.1016/j.matpur.2025.103671
Piotr B. Mucha , Maja Szlenk , Ewelina Zatorska
We analyze the pressureless Navier-Stokes system with nonlocal attraction–repulsion forces. Such systems appear in the context of models of collective behaviour. We prove the existence of weak solutions on the whole space R3 in the case of density-dependent degenerate viscosity. For the nonlocal term it is assumed that the interaction kernel has the quadratic growth at infinity and almost quadratic singularity at zero. Under these assumptions, we derive the analog of the Bresch–Desjardins and Mellet–Vasseur estimates for the nonlocal system. In particular, we are able to adapt the approach of Vasseur and Yu [37], [36] to construct a weak solution.
我们分析了具有非局部吸引-排斥力的无压Navier-Stokes系统。这样的系统出现在集体行为模型的背景下。证明了密度相关简并粘性问题在全空间R3上弱解的存在性。对于非局部项,假定相互作用核在无穷远处具有二次增长,在零处几乎具有二次奇点。在这些假设下,我们导出了非局部系统的Bresch-Desjardins和Mellet-Vasseur估计的类比。特别地,我们可以采用Vasseur和Yu b[37],[36]的方法来构造弱解。
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引用次数: 0
Infinitesimal conformal restriction and unitarizing measures for Virasoro algebra Virasoro代数的无穷小共形限制和统一措施
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-03-01 Epub Date: 2025-01-15 DOI: 10.1016/j.matpur.2025.103669
Maria Gordina , Wei Qian , Yilin Wang
We use the SLEκ loop measure to construct a natural representation of the Virasoro algebra of central charge c=c(κ)1. In particular, we introduce a non-degenerate bilinear Hermitian form (and non positive-definite) using the SLE loop measure and show that the representation is indefinite unitary. Our proof relies on the infinitesimal conformal restriction property of the SLE loop measure.
我们使用SLEκ环测度构造了中心电荷c=c(κ)≤1的Virasoro代数的自然表示。特别地,我们利用SLE环测度引入了一种非退化双线性厄米特形式(非正定),并证明了其表示是不定酉的。我们的证明依赖于SLE环测度的无限小共形限制性质。
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引用次数: 0
Non-linear operator-valued elliptic flows with application to quantum field theory 非线性算子值椭圆流及其在量子场论中的应用
IF 2.1 1区 数学 Q1 MATHEMATICS Pub Date : 2025-03-01 Epub Date: 2025-01-15 DOI: 10.1016/j.matpur.2025.103657
Jean-Bernard Bru , Nathan Metraud
Differential equations on spaces of operators are very little developed in Mathematics, being in general very challenging. Here, we study a novel system of such (non-linear) differential equations. We show it has a unique solution for all times, for instance in the Schatten norm topology. This system presents remarkable ellipticity properties that turn out to be crucial for the study of the infinite-time limit of its solution, which is proven under relatively weak, albeit probably not necessary, hypotheses on the initial data. This system of differential equations is the elliptic counterpart of an hyperbolic flow applied to quantum field theory to diagonalize Hamiltonians that are quadratic in the bosonic field. In a similar way, this elliptic flow, in particular its asymptotics, has application in quantum field theory: it can be used to diagonalize Hamiltonians that are quadratic in the fermionic field while giving new explicit expressions and properties of these pivotal Hamiltonians of quantum field theory and quantum statistical mechanics.
在数学中,算子空间上的微分方程很少得到发展,通常是非常具有挑战性的。在这里,我们研究了一类新的(非线性)微分方程系统。我们证明了它在任何时候都有一个唯一的解,例如在Schatten范数拓扑中。这个系统表现出显著的椭圆性,这对研究其解的无限时间限制至关重要,这是在相对较弱的假设下证明的,尽管可能不是必要的,在初始数据上。这个微分方程组是应用于量子场论的双曲流的椭圆对应体,用于对角化玻色子场中的二次哈密顿量。同样,这种椭圆流,特别是它的渐近性,在量子场论中也有应用:它可以用来对角化费米子场中的二次哈密顿量,同时给出量子场论和量子统计力学中这些关键哈密顿量的新的显式表达式和性质。
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引用次数: 0
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Journal de Mathematiques Pures et Appliquees
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