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Ocneanu Algebra of Seams: Critical Unitary $E_6$ RSOS Lattice Model 奥克纳努接缝代数:临界单元 $E_6$ RSOS 晶格模型
Pub Date : 2024-09-10 DOI: arxiv-2409.06236
Paul A. Pearce, Jorgen Rasmussen
We consider the $A$ series and exceptional $E_6$ Restricted Solid-On-Solidlattice models as prototypical examples of the critical Yang-Baxter integrabletwo-dimensional $A$-$D$-$E$ lattice models. We focus on type I theories whichare characterized by the existence of an extended chiral symmetry in thecontinuum scaling limit. Starting with the commuting family of column transfermatrices on the torus, we build matrix representations of the Ocneanu graphfusion algebra as integrable seams for arbitrary finite-size lattices with thestructure constants specified by Petkova and Zuber. This commutative seamalgebra contains the Verlinde, fused adjacency and graph fusion algebras assubalgebras. Our matrix representation of the Ocneanu algebra encapsulates thequantum symmetry of the commuting family of transfer matrices. In the continuumscaling limit, the integrable seams realize the topological defects of theassociated conformal field theory and the known toric matrices encode thetwisted conformal partition functions.
我们把 $A$ 系列和特殊的 $E_6$ 限制固态-固态晶格模型视为临界杨-巴克斯特可积分二维 $A$-$D$-$E$ 晶格模型的原型。我们将重点放在 I 型理论上,该理论的特点是在连续缩放极限中存在扩展的手性对称性。从环面上列转移矩阵的换元族开始,我们建立了奥克纳努图融合代数的矩阵表示,作为任意有限大小晶格的可积分接缝,其结构常数由 Petkova 和 Zuber 规定。这个交换接缝代数包含韦林德、融合邻接和图融合代数。我们对奥克涅努代数的矩阵表示囊括了交换转移矩阵族的量子对称性。在连续缩放极限中,可积分接缝实现了相关共形场论的拓扑缺陷,而已知的环矩阵则编码了扭曲共形分割函数。
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引用次数: 0
Derived algebraic geometry of 2d lattice Yang-Mills theory 二维晶格杨-米尔斯理论的衍生代数几何
Pub Date : 2024-09-10 DOI: arxiv-2409.06873
Marco Benini, Tomás Fernández, Alexander Schenkel
A derived algebraic geometric study of classical $mathrm{GL}_n$-Yang-Millstheory on the $2$-dimensional square lattice $mathbb{Z}^2$ is presented. Thederived critical locus of the Wilson action is described and its local datasupported in rectangular subsets $V =[a,b]times [c,d]subseteq mathbb{Z}^2$with both sides of length $geq 2$ is extracted. A locally constantdg-category-valued prefactorization algebra on $mathbb{Z}^2$ is constructedfrom the dg-categories of perfect complexes on the derived stacks of localdata.
本文介绍了在 2 美元维正方形网格 $mathbb{Z}^2$ 上经典 $mathrm{GL}_n$ 扬-米尔理论的衍生代数几何研究。描述了威尔逊作用的临界点,并提取了其在两边长度均为 $geq 2$ 的矩形子集 $V =[a,b]times [c,d]subseteq mathbb{Z}^2$ 中的局部数据支持。从局部数据的派生堆栈上的完备复数的 dg 类中构造了一个关于 $mathbb{Z}^2$ 的局部恒定的 dg 类值的前因式分解代数。
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引用次数: 0
Limits of spectral measures for linearly bounded and for Poisson distributed random potentials 线性有界和泊松分布随机势的谱量极限
Pub Date : 2024-09-10 DOI: arxiv-2409.06508
David Hasler, Jannis Koberstein
We show the existence of infinite volume limits of resolvents and spectralmeasures for a class of Schroedinger operators with linearly boundedpotentials. We then apply this result to Schroedinger operators with a Poissondistributed random potential.
我们证明了一类具有线性约束势的薛定谔算子的解析量和谱量的无限体积极限的存在性。然后,我们将这一结果应用于具有泊松分布随机势的薛定谔算子。
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引用次数: 0
On the semilinear heat equation with the Grushin operator 关于带有格鲁申算子的半线性热方程
Pub Date : 2024-09-10 DOI: arxiv-2409.06578
Geronimo Oliveira, Arlúcio Viana
In this work, we study the heat equation with Grushin's operator. We presentan expression for its heat kernel and get regularity properties and decay on$L^p$ spaces for both heat Kernel and semigroup associated to Grushin'soperator. Next, we use the results to prove the existence, uniqueness,continuous dependence and blowup alternative of mild solutions of a nonlinearCauchy's problem associated to Grushin's operator.
在这项工作中,我们研究了带有格鲁申算子的热方程。我们提出了其热核的表达式,并得到了热核和与格鲁申算子相关的半群在$L^p$空间上的正则特性和衰减。接下来,我们利用这些结果证明了与格鲁申算子相关的非线性考奇问题的温和解的存在性、唯一性、连续依赖性和炸毁替代性。
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引用次数: 0
Symmetry Breaking in Neural Network Optimization: Insights from Input Dimension Expansion 神经网络优化中的对称性破坏:输入维度扩展的启示
Pub Date : 2024-09-10 DOI: arxiv-2409.06402
Jun-Jie Zhang, Nan Cheng, Fu-Peng Li, Xiu-Cheng Wang, Jian-Nan Chen, Long-Gang Pang, Deyu Meng
Understanding the mechanisms behind neural network optimization is crucialfor improving network design and performance. While various optimizationtechniques have been developed, a comprehensive understanding of the underlyingprinciples that govern these techniques remains elusive. Specifically, the roleof symmetry breaking, a fundamental concept in physics, has not been fullyexplored in neural network optimization. This gap in knowledge limits ourability to design networks that are both efficient and effective. Here, wepropose the symmetry breaking hypothesis to elucidate the significance ofsymmetry breaking in enhancing neural network optimization. We demonstrate thata simple input expansion can significantly improve network performance acrossvarious tasks, and we show that this improvement can be attributed to theunderlying symmetry breaking mechanism. We further develop a metric to quantifythe degree of symmetry breaking in neural networks, providing a practicalapproach to evaluate and guide network design. Our findings confirm thatsymmetry breaking is a fundamental principle that underpins variousoptimization techniques, including dropout, batch normalization, andequivariance. By quantifying the degree of symmetry breaking, our work offers apractical technique for performance enhancement and a metric to guide networkdesign without the need for complete datasets and extensive training processes.
了解神经网络优化背后的机制对于改进网络设计和性能至关重要。虽然已经开发出了各种优化技术,但对支配这些技术的基本原理的全面了解仍然遥遥无期。具体来说,对称性破缺是物理学中的一个基本概念,但它在神经网络优化中的作用尚未得到充分探索。这一知识空白限制了我们设计既高效又有效的网络的能力。在此,我们提出了对称性破缺假说,以阐明对称性破缺在增强神经网络优化方面的意义。我们证明了简单的输入扩展就能显著提高网络在各种任务中的性能,并证明这种提高可归因于基本的对称性破缺机制。我们进一步开发了一种量化神经网络对称性破坏程度的指标,为评估和指导网络设计提供了一种实用方法。我们的研究结果证实,对称性破坏是支撑各种优化技术的基本原理,包括剔除、批量归一化和方差。通过量化对称性破坏的程度,我们的工作为性能提升提供了实用技术,并为指导网络设计提供了衡量标准,而无需完整的数据集和大量的训练过程。
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引用次数: 0
Symmetry generators and quantum numbers for fermionic circularly symmetric motion 费米圆周对称运动的对称发生器和量子数
Pub Date : 2024-09-10 DOI: arxiv-2409.06850
V. B. Mendrot, A. S. de Castro, P. Alberto
The planar dynamics of spin-1/2 quantum relativistic particles is importantfor several physical systems. In this paper we derive, by a simple method, thegenerators for the continuous symmetries of the 3+1 Dirac equation for planarmotion, when there is circular symmetry, i.e., the interactions depend only onthe radial coordinate. We consider a general set of potentials with differentLorentz structures. These generators allow for several minimal complete sets ofcommuting observables and their corresponding quantum numbers. We show how theycan be used to label the general eigenspinors for this problem. We also derivethe generators of the spin and pseudospin symmetries for this planar Diracproblem, which arise when the vector and scalar potentials have the samemagnitude and tensor potential and the space components of the four-vectorpotential are absent. We investigate the associated energy degeneracies andcompare them to the known degeneracies in the spherically symmetric 3+1 Diracequation.
自旋-1/2 量子相对性粒子的平面动力学对若干物理系统非常重要。在本文中,我们通过一种简单的方法,推导出了当存在圆对称性(即相互作用只依赖于径向坐标)时,3+1 迪拉克方程的连续对称性平面运动的发生器。我们考虑了具有不同洛伦兹结构的一般势集。这些发生器可以产生几组最小的完整交换观测值及其相应的量子数。我们展示了如何利用它们来标注这个问题的一般特征旋子。我们还推导出了这个平面狄拉克问题的自旋和伪自旋对称性发生器,当矢量势和标量势具有相同的磁性和张量势,并且不存在四矢量势的空间分量时,就会产生这些发生器。我们研究了相关的能量退行性,并将它们与已知的球对称 3+1 Diracequation 中的退行性进行了比较。
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引用次数: 0
Mathematical foundations of phonons in incommensurate materials 不相容材料中声子的数学基础
Pub Date : 2024-09-10 DOI: arxiv-2409.06151
Michael Hott, Alexander B. Watson, Mitchell Luskin
In some models, periodic configurations can be shown to be stable under,both, global $ell^2$ or local perturbations. This is not the case foraperiodic media. The specific class of aperiodic media we are interested, inarise from taking two 2D periodic crystals and stacking them parallel at arelative twist. In periodic media, phonons are generalized eigenvectors for astability operator acting on $ell^2$, coming from a mechanical energy. Thegoal of our analysis is to provide phonons in the given class of aperiodicmedia with meaning. As rigorously established for the 1D Frenkel-Kontorovamodel and previously applied by one of the authors, we assume that we canparametrize minimizing lattice deformations w.r.t. local perturbations viacontinuous stacking-periodic functions, for which we previously derived acontinuous energy density functional. Such (continuous) energy densities areanalytically and computationally much better accessible compared to discreteenergy functionals. In order to pass to an $ell^2$-based energy functional, wealso study the offset energy w.r.t. given lattice deformations, under$ell^1$-perturbations. Our findings show that, in the case of an undeformedbilayer heterostructure, while the energy density can be shown to be stableunder the assumption of stability of individual layers, the offset energy failsto be stable in the case of twisted bilayer graphene. We then establishconditions for stability and instability of the offset energy w.r.t. therelaxed lattice. Finally, we show that, in the case of incommensurate bilayerhomostructures, i.e., two equal layers, if we choose minimizing deformationsaccording to the global energy density above, the offset energy is stable inthe limit of zero twist angle. Consequently, in this case, one can then definephonons as generalized eigenvectors w.r.t. the stability operator associatedwith the offset energy.
在某些模型中,可以证明周期构型在全局$ell^2$或局部扰动下都是稳定的。但对于非周期性介质来说,情况并非如此。我们感兴趣的这一类非周期性介质,是由两个二维周期晶体以等比扭转方式平行堆叠而成的。在周期介质中,声子是作用于 $ell^2$ 的可变算子的广义特征向量,来自机械能。我们分析的目的是让声子在给定的非周期性介质中具有意义。正如为一维 Frenkel-Kontorov 模型所严格建立的以及作者之一先前所应用的那样,我们假定我们可以将与局部扰动相关的最小化晶格变形参数化为连续的堆积周期函数,我们先前已经为其导出了连续的能量密度函数。与离散能量函数相比,这种(连续)能量密度在分析和计算上都更容易获得。为了过渡到基于 $ell^2$ 的能量函数,我们还研究了在$ell^1$扰动下与给定晶格变形相关的偏移能量。我们的研究结果表明,在未变形的双层异质结构中,虽然在单层稳定的假设下能量密度可以证明是稳定的,但在扭曲的双层石墨烯中,偏移能量却不稳定。然后,我们建立了偏移能量相对于延迟晶格的稳定性和不稳定性的条件。最后,我们证明,在不相称的双层同构情况下,即两个相等的层,如果我们根据上述全局能量密度选择最小变形,偏移能量在零扭曲角的极限下是稳定的。因此,在这种情况下,我们可以将phonons定义为与偏移能相关的稳定算子的广义特征向量。
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引用次数: 0
Quantitative Quantum Zeno and Strong Damping Limits in Strong Topology 强拓扑学中的量子芝诺和强阻尼极限
Pub Date : 2024-09-10 DOI: arxiv-2409.06469
Robert Salzmann
Frequent applications of a mixing quantum operation to a quantum system slowdown its time evolution and eventually drive it into the invariant subspace ofthe named operation. We prove this phenomenon, the quantum Zeno effect, and itscontinuous variant, strong damping, in a unified way for infinite-dimensionalopen quantum systems, while merely demanding that the respective mixingconvergence holds pointwise for all states. Both results are quantitative inthe following sense: Given the speed of convergence for the mixing limits, wecan derive bounds on the convergence speed for the corresponding quantum Zenoand strong damping limits. We apply our results to prove quantum Zeno andstrong damping limits for the photon loss channel with an explicit bound on theconvergence speed.
对量子系统频繁应用混合量子操作会减慢其时间演化,并最终将其驱赶到指定操作的不变子空间。我们以统一的方式证明了无限维开放量子系统的这种现象--量子芝诺效应及其连续变体--强阻尼,而仅仅要求各自的混合收敛对所有状态都点对点地成立。这两个结果在以下意义上都是定量的:鉴于混合极限的收敛速度,我们可以推导出相应量子芝诺极限和强阻尼极限的收敛速度边界。我们应用我们的结果证明了光子损耗通道的量子芝诺极限和强阻尼极限,并给出了收敛速度的明确约束。
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引用次数: 0
Basics of Multiple Polyexponential Integrals 多重多项式积分的基础知识
Pub Date : 2024-09-10 DOI: arxiv-2409.06760
Gleb Aminov, Paolo Arnaudo
We introduce a set of special functions called multiple polyexponentialintegrals, defined as iterated integrals of the exponential integral$text{Ei}(z)$. These functions arise in certain perturbative expansions of thelocal solutions of second-order ODEs around an irregular singularity. Inparticular, their recursive definition describes the asymptotic behavior ofthese local solutions. To complement the study of the multiple polyexponentialintegrals on the entire complex plane, we relate them with two other sets ofspecial functions - the undressed and dressed multiple polyexponentialfunctions - which are characterized by their Taylor series expansions aroundthe origin.
我们引入了一组称为多重多指数积分的特殊函数,它们被定义为指数积分$text{Ei}(z)$的迭代积分。这些函数出现在不规则奇点周围二阶 ODEs 局部解的某些扰动展开中。特别是,它们的递归定义描述了这些局部解的渐近行为。为了补充对整个复平面上多重多指数积分的研究,我们将它们与另外两组特殊函数联系起来,这两组特殊函数分别是未着色多重多指数函数和着色多重多指数函数,它们以围绕原点的泰勒级数展开为特征。
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引用次数: 0
A compact QUBO encoding of computational logic formulae demonstrated on cryptography constructions 通过密码学构造展示计算逻辑公式的紧凑 QUBO 编码
Pub Date : 2024-09-10 DOI: arxiv-2409.07501
Gregory Morse, Tamás Kozsik, Oskar Mencer, Peter Rakyta
We aim to advance the state-of-the-art in Quadratic Unconstrained BinaryOptimization formulation with a focus on cryptography algorithms. As theminimal QUBO encoding of the linear constraints of optimization problemsemerges as the solution of integer linear programming (ILP) problems, bysolving special boolean logic formulas (like ANF and DNF) for their integercoefficients it is straightforward to handle any normal form, or anysubstitution for multi-input AND, OR or XOR operations in a QUBO form. Toshowcase the efficiency of the proposed approach we considered the mostwidespread cryptography algorithms including AES-128/192/256, MD5, SHA1 andSHA256. For each of these, we achieved QUBO instances reduced by thousands oflogical variables compared to previously published results, while keeping theQUBO matrix sparse and the magnitude of the coefficients low. In the particularcase of AES-256 cryptography function we obtained more than 8x reduction invariable count compared to previous results. The demonstrated reduction in QUBOsizes notably increases the vulnerability of cryptography algorithms againstfuture quantum annealers, capable of embedding around $30$ thousands of logicalvariables.
我们的目标是以密码学算法为重点,推进二次无约束二进制优化表述的最新发展。由于优化问题的线性约束的最小 QUBO 编码是作为整数线性规划(ILP)问题的解决方案出现的,通过解决其整数系数的特殊布尔逻辑公式(如 ANF 和 DNF),可以直接处理任何正则表达式,或以 QUBO 形式处理多输入 AND、OR 或 XOR 操作的任何替换。为了展示所提方法的效率,我们考虑了最常见的加密算法,包括 AES-128/192/256、MD5、SHA1 和 SHA256。与之前公布的结果相比,我们为每种算法实现的 QUBO 实例都减少了数千个逻辑变量,同时保持了 QUBO 矩阵的稀疏性和系数的低幅度。在 AES-256 密码学函数的特殊情况下,与以前的结果相比,我们的不变量数量减少了 8 倍多。所证明的 QUBO 大小的减少显著增加了加密算法在未来量子退火器面前的脆弱性,而量子退火器能够嵌入大约 30 美元的数千个逻辑变量。
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引用次数: 0
期刊
arXiv - MATH - Mathematical Physics
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