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Les Houches lecture notes on topological recursion 关于拓扑递归的 Les Houches 讲座笔记
Pub Date : 2024-09-10 DOI: arxiv-2409.06657
Vincent Bouchard
You may have seen the words "topological recursion" mentioned in papers onmatrix models, Hurwitz theory, Gromov-Witten theory, topological string theory,knot theory, topological field theory, JT gravity, cohomological field theory,free probability theory, gauge theories, to name a few. The goal of theselecture notes is certainly not to explain all these applications of thetopological recursion framework. Rather, the intention is to provide adown-to-earth (and hopefully accessible) introduction to topological recursionitself, so that when you see these words mentioned, you can understand what itis all about. These lecture notes accompanied a series of lectures at the LesHouches school "Quantum Geometry (Mathematical Methods for Gravity, GaugeTheories and Non-Perturbative Physics)" in Summer 2024.
你可能在有关矩阵模型、赫维茨理论、格罗莫夫-维滕理论、拓扑弦理论、结理论、拓扑场论、JT引力、同调场论、自由概率论、规规理论等的论文中见过 "拓扑递归 "这几个字。本讲座的目的当然不是解释拓扑递归框架的所有这些应用。相反,我们的目的是为拓扑递归本身提供一个朴实的(希望是通俗易懂的)介绍,这样当你看到这些词被提及时,你就能明白它是怎么回事了。这些讲座笔记伴随着 2024 年夏天在莱昂-胡什学校举办的 "量子几何(引力、量子理论和非扰动物理的数学方法)"系列讲座。
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引用次数: 0
Zero Flux Localization: Magic Revealed 零流量》本地化:魔法揭秘
Pub Date : 2024-09-09 DOI: arxiv-2409.05942
Alireza Parhizkar, Victor Galitski
Flat bands correspond to the spatial localization of a quantum particlemoving in a field with discrete or continuous translational invariance. Thecanonical example is the flat Landau levels in a homogeneous magnetic field.Several significant problems -- including flat bands in moir'e structures --are related to the problem of a particle moving in an inhomogeneous magneticfield with zero total flux. We demonstrate that while perfectly flat bands insuch cases are impossible, the introduction of a "non-Abelian component" -- aspin field with zero total curvature -- can lead to perfect localization.Several exactly solvable models are constructed: (i) a half-space up/down fieldwith a sharp 1D boundary; (ii) an alternating up/down field periodic in onedirection on a cylinder; and (iii) a doubly periodic alternating field on atorus. The exact solution on the torus is expressed in terms of ellipticfunctions. It is shown that flat bands are only possible for certain magicvalues of the field corresponding to a quantized flux through an individualtile. These exact solutions clarify the simple structure underlying flat bandsin moir'e materials and provide a springboard for constructing a novel classof fractional quantum Hall states.
平带对应于在具有离散或连续平移不变性的场中运动的量子粒子的空间定位。几个重要问题--包括莫尔结构中的平带--与粒子在总磁通量为零的不均匀磁场中运动的问题有关。我们证明,虽然在这种情况下不可能出现完美的平带,但引入 "非阿贝尔成分"--总曲率为零的磁场--可以导致完美的局部化。我们构建了几个可精确求解的模型:(i) 具有尖锐一维边界的半空间上下磁场;(ii) 圆柱上周期性单向上下交变磁场;(iii) 环上的双周期交变磁场。环上的精确解用椭圆函数表示。结果表明,平带只可能出现在与通过单个面的量子化通量相对应的场的某些神奇值上。这些精确解澄清了莫尔材料平带的简单结构,并为构建一类新的分数量子霍尔态提供了跳板。
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引用次数: 0
Hietarinta's classification of $4times 4$ constant Yang-Baxter operators using algebraic approach 希塔林塔用代数方法对$4/times 4$ 恒定杨-巴克斯特算子的分类
Pub Date : 2024-09-09 DOI: arxiv-2409.05375
Somnath Maity, Vivek Kumar Singh, Pramod Padmanabhan, Vladimir Korepin
Classifying Yang-Baxter operators is an essential first step in the study ofthe simulation of integrable quantum systems on quantum computers. One of theearliest initiatives was taken by Hietarinta in classifying constantYang-Baxter solutions for a two-dimensional local Hilbert space (qubitrepresentation). He obtained 11 families of invertible solutions, including theone generated by the permutation operator. While these methods work well for 4by 4 solutions, they become cumbersome for higher dimensional representations.In this work, we overcome this restriction by constructing the constantYang-Baxter solutions in a representation independent manner by usingans"{a}tze from algebraic structures. We use four different algebraicstructures that reproduce 10 of the 11 Hietarinta families when the qubitrepresentation is chosen. The methods include a set of commuting operators,Clifford algebras, Temperley-Lieb algebras, and partition algebras. We do notobtain the $(2,2)$ Hietarinta class with these methods.
杨-巴克斯特算子的分类是在量子计算机上模拟可积分量子系统的研究中必不可少的第一步。希塔林塔(Hietarinta)最早对二维局部希尔伯特空间(量子位表示)的杨-巴克斯特常数解进行了分类。他获得了 11 个可逆解系列,包括由置换算子产生的可逆解。在这项工作中,我们克服了这一限制,通过使用代数结构,以一种与表示无关的方式构造了常杨-巴克斯特解。我们使用四种不同的代数结构,在选择量子比特表征时重现了 11 个希塔林塔族中的 10 个。这些方法包括一组换向算子、克利福德代数、Temperley-Lieb 代数和分区代数。我们没有用这些方法得到 $(2,2)$ Hietarinta 类。
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引用次数: 0
Auxiliary Field Deformations of (Semi-)Symmetric Space Sigma Models 半)对称空间西格玛模型的辅助场变形
Pub Date : 2024-09-09 DOI: arxiv-2409.05704
Daniele Bielli, Christian Ferko, Liam Smith, Gabriele Tartaglino-Mazzucchelli
We generalize the auxiliary field deformations of the principal chiral model(PCM) introduced in arXiv:2405.05899 and arXiv:2407.16338 to sigma models whosetarget manifolds are symmetric or semi-symmetric spaces, including aWess-Zumino term in the latter case. This gives rise to a new infinite familyof classically integrable $mathbb{Z}_2$ and $mathbb{Z}_4$ coset models of theform which are of interest in applications of integrability to worldsheetstring theory and holography. We demonstrate that every theory in this infiniteclass admits a zero-curvature representation for its equations of motion byexhibiting a Lax connection.
我们将arXiv:2405.05899和arXiv:2407.16338中介绍的主手性模型(PCM)的辅助场变形推广到西格玛模型,后者的目标流形是对称或半对称空间,包括一个韦斯-祖米诺项。这就产生了一个新的无限经典可积分的$mathbb{Z}_2$和$mathbb{Z}_4$共集模型家族,它们在世界表弦理论和全息学的可积分性应用中具有重要意义。我们证明,这个无穷类中的每一个理论都能通过显示拉克斯连接为其运动方程提供零曲率表示。
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引用次数: 0
Optimal Distillation of Coherent States with Phase-Insensitive Operations 相干状态的最佳蒸馏与相位不敏感操作
Pub Date : 2024-09-09 DOI: arxiv-2409.05974
Shiv Akshar Yadavalli, Iman Marvian
By combining multiple copies of noisy coherent states of light (or otherbosonic systems), it is possible to obtain a single mode in a state with lessernoise, a process known as distillation or purification of coherent states. Weinvestigate the distillation of coherent states from coherent thermal statesunder general phase-insensitive operations, and find a distillation protocolthat is optimal in the asymptotic regime, i.e., when the number of input copiesis much greater than 1. Remarkably, we find that in this regime, the error --as quantified by infidelity (one minus the fidelity) of the output state withthe desired coherent state -- is proportional to the inverse of the purity ofcoherence of the input state, a quantity obtained from theRight-Logarithmic-Derivative (RLD) Fisher information metric, hence revealingan operational interpretation of this quantity. The heart of this protocol is aphase-insensitive channel that optimally converts an input coherent thermalstate with high amplitude, into an output with significantly lower amplitudeand temperature. Under this channel, the purity of coherence remainsasymptotically conserved. While both the input and desired output are Gaussianstates, we find that the optimal protocol cannot be a Gaussian channel. AmongGaussian phase-insensitive channels, the optimal distillation protocol is asimple linear optical scheme that can be implemented with beam splitters.
通过组合光(或其他玻色子系统)噪声相干态的多个副本,有可能获得噪声较小状态下的单一模式,这一过程被称为相干态的蒸馏或净化。我们研究了在一般相位不敏感操作下从相干热态蒸馏出相干态的过程,并发现了一种在渐近机制下最优的蒸馏协议,即当输入拷贝数远大于 1 时。值得注意的是,我们发现在这种情况下,误差--以输出状态与所需相干状态的不保真度(保真度减一)来量化--与输入状态的相干纯度的倒数成正比,而输入状态的相干纯度是从右对数派生(RLD)费雪信息度量中得到的,因此揭示了这个量的操作解释。该协议的核心是一个对相位不敏感的通道,它能以最佳方式将输入的高振幅相干热态转换为振幅和温度明显较低的输出。在这种通道下,相干性的纯度保持近似守恒。虽然输入和期望输出都是高斯状态,但我们发现最优协议不可能是高斯信道。在高斯相位不敏感信道中,最佳蒸馏协议是一种简单的线性光学方案,可以通过分束器实现。
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引用次数: 0
Traveling Motility of Actin Lamellar Fragments Under spontaneous symmetry breaking 自发对称破缺下肌动蛋白片段的移动性
Pub Date : 2024-09-09 DOI: arxiv-2409.05762
Claudia García, Martina Magliocca, Nicolas Meunier
Cell motility is connected to the spontaneous symmetry breaking of a circularshape. In https://doi.org/10.1103/PhysRevLett.110.078102, Blanch-Mercader andCasademunt perfomed a nonlinear analysis of the minimal model proposed byCallan and Jones https://doi.org/10.1103/PhysRevLett.100.258106 and numericallyconjectured the existence of traveling solutions once that symmetry is broken.In this work, we prove analytically that conjecture by means of nonlinearbifurcation techniques.
细胞运动与圆形的自发对称破缺有关。在 https://doi.org/10.1103/PhysRevLett.110.078102,Blanch-Mercader 和 Casademunt 对 Callan 和 Jones 提出的最小模型进行了非线性分析 https://doi.org/10.1103/PhysRevLett.100.258106,并从数值上猜想,一旦对称性被打破,就会存在行进解。在这项工作中,我们通过非线性分岔技术分析证明了这一猜想。
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引用次数: 0
Singularity formed by the collision of two collapsing solitons in interaction for the 2D Keller-Segel system 二维凯勒-西格尔系统中两个坍缩孤子在相互作用中碰撞形成的奇点
Pub Date : 2024-09-09 DOI: arxiv-2409.05363
Charles Collot, Tej-Eddine Ghoul, Nader Masmoudi, Van Tien Nguyen
It is well-known that the two-dimensional Keller-Segel system admits finitetime blowup solutions, which is the case if the initial density has a totalmass greater than $8pi$ and a finite second moment. Several constructiveexamples of such solutions have been obtained, where for all of them aperturbed stationary state undergoes scale instability and collapses at apoint, resulting in a $8pi$-mass concentration. It was conjectured thatsingular solutions concentrating simultaneously more than one solitons couldexist. We construct rigorously such a new blowup mechanism, where twostationary states are simultaneously collapsing and colliding, resulting in a$16pi$-mass concentration at a single blowup point, and with a new blowup ratewhich corresponds to the formal prediction by Seki, Sugiyama and Vel'azquez.We develop for the first time a robust framework to construct rigorously suchblowup solutions involving simultaneously the non-radial collision andconcentration of several solitons, which we expect to find applications toother evolution problems.
众所周知,二维凯勒-西格尔系统存在有限时间爆炸解,如果初始密度的总质量大于8pi$且具有有限的第二矩,就会出现这种情况。已经得到了几个这种解的构造性实例,其中所有的扰动静止态都经历了尺度不稳定性,并在一点坍缩,导致质量浓度为8pi$。有人猜想,同时集中了不止一个孤子的奇异解可能存在。我们严格地构建了这样一种新的炸裂机制,即两个静止态同时发生坍缩和碰撞,从而在单个炸裂点产生一个 16 美元的质量浓度,而且新的炸裂率与 Seki、Sugiyama 和 Vel'azquez 的正式预测相一致。我们首次建立了一个稳健的框架,以严格地构建这种同时涉及多个孤子的非径向碰撞和浓度的炸裂解,我们期望它能应用于其他演化问题。
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引用次数: 0
Decomposition of global solutions for a class of nonlinear wave equations 一类非线性波方程全局解的分解
Pub Date : 2024-09-09 DOI: arxiv-2409.05272
Georgios Mavrogiannis, Avy Soffer, Xiaoxu Wu
In the present paper we consider global solutions of a class of non-linearwave equations of the form begin{equation*} Box u= N(x,t,u)u, end{equation*} where the nonlinearity~$ N(x,t,u)u$ isassumed to satisfy appropriate boundedness assumptions. Under these appropriate assumptions we prove that the free channel waveoperator exists. Moreover, if the interaction term~$N(x,t,u)u$ is localised,then we prove that the global solution of the full nonlinear equation can bedecomposed into a `free' part and a `localised' part. The present work can be seen as an extension of the scattering resultsof~cite{SW20221} for the Schr"odinger equation.
在本文中,我们考虑了一类非线性波方程的全局解,其形式为Box u= N(x,t,u)u, end{equation*} 其中假定非线性~$ N(x,t,u)u$ 满足适当的有界性假设。在这些适当的假设条件下,我们证明自由通道波操作器是存在的。此外,如果相互作用项~$N(x,t,u)u$ 是局部的,那么我们证明全非线性方程的全局解可以分解为 "自由 "部分和 "局部 "部分。本研究可视为施尔丁格方程散射结果的扩展。
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引用次数: 0
Completeness Relation in Renormalized Quantum Systems 重正化量子系统中的完备性关系
Pub Date : 2024-09-09 DOI: arxiv-2409.05372
Fatih Erman, O. Teoman Turgut
In this work, we show that the completeness relation for the eigenvectors,which is an essential assumption of quantum mechanics, remains true if theinitial Hamiltonian, having a discrete spectrum, is modified by a deltapotential (to be made precise by a renormalization scheme) supported at a pointin two and three-dimensional compact manifolds or Euclidean spaces. Theformulation can be easily extended to $N$ center case, and the case where deltainteraction is supported on curves in the plane or space.
在这项工作中,我们证明了如果具有离散谱的初始哈密顿被二维和三维紧凑流形或欧几里得空间中的一个点上支持的德尔势(通过重正化方案使其精确化)所修正,那么作为量子力学基本假设的特征向量的完备性关系仍然是真实的。这个公式可以很容易地扩展到以 $N$ 为中心的情况,以及在平面或空间的曲线上支持三角作用的情况。
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引用次数: 0
Nonabelian Anyon Condenstion in 2+1d topological orders: A String-Net Model Realization 2+1d 拓扑阶中的非阿贝尔安永共轭:弦网模型的实现
Pub Date : 2024-09-09 DOI: arxiv-2409.05852
Yu Zhao, Yidun Wan
We develop a comprehensive framework for realizing anyon condensation oftopological orders within the string-net model by constructing a Hamiltonianthat bridges the parent string-net model before and the child string-net modelafter anyon condensation. Our approach classifies all possible types of bosonicanyon condensation in any parent string-net model and identifies the basicdegrees of freedom in the corresponding child models. Compared with thetraditional UMTC perspective of topological orders, our method offers a finercategorical description of anyon condensation at the microscopic level. We alsoexplicitly represent relevant UMTC categorical entities characterizing anyoncondensation through our model-based physical quantities, providing practicalalgorithms for calculating these categorical data.
我们建立了一个在弦网模型中实现拓扑阶任子凝聚的综合框架,方法是构建一个哈密顿,在任子凝聚前的母弦网模型和任子凝聚后的子弦网模型之间架起桥梁。我们的方法对任何母弦网模型中所有可能的玻色子凝聚类型进行了分类,并确定了相应子模型中的基本自由度。与传统的 UMTC 拓扑阶次视角相比,我们的方法在微观层面提供了对玻色子凝聚的精细分类描述。我们还通过基于模型的物理量,明确表示了表征任子凝聚的相关 UMTC 分类实体,并提供了计算这些分类数据的实用算法。
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引用次数: 0
期刊
arXiv - MATH - Mathematical Physics
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