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2605.22280 2026-05-22 math.AC math.CO

Cellular resolutions of second powers of square-free monomial ideals with divisibility relations

二次幂的平方自由单项理想细胞 resolutions 与可除关系

Susan M. Cooper, Sabine El Khoury, Sara Faridi, Susan Morey, Liana M. Sega, Sandra Spiroff

AI总结 本文研究了具有可除关系的平方自由单项理想二次幂的细胞自由 resolutions,利用离散 Morse 理论构造了特定理想下的最小 resolutions,并给出了二次幂的射影维数的精确界。

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AI中文摘要

利用平方自由单项理想 $I$ 的生成元之间的可除关系,我们描述了 $I^2$ 的生成元之间的可除关系。然后我们运用离散 Morse 理论来产生一个 $I^2$ 的细胞自由 resolutions,该 resolutions 对于特定的理想是极小的,这些理想在给定的可除关系下是极值的。特别是,我们提供了当 $I$ 的生成元满足至少一个可除关系时,$I^2$ 的射影维数的精确界。

英文摘要

Using divisibility relations between the generators of a square-free monomial ideal $I$, we describe divisibility relations between the generators of the second power $I^2$. We then employ discrete Morse theory to produce a cellular free resolution of $I^2$ which is minimal for specific ideals that are extremal with respect to a given divisibility relation. In particular, we provide sharp bounds on the projective dimension of $I^2$ when the generators of $I$ satisfy at least one divisibility relation.

2605.22278 2026-05-22 cond-mat.mes-hall cond-mat.supr-con

Topological semimetals: surface transport and spin effects

拓扑半金属:表面输运和自旋效应

E. V. Deviatov

AI总结 本文综述了拓扑半金属中电荷和自旋输运的研究,探讨了其表面态的特性及非线性反常霍尔效应,并讨论了其在新型拓扑材料中的潜在应用。

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AI中文摘要

在固态物理中,对拓扑系统的兴趣主要与拓扑半金属相关,特别是韦伊尔半金属作为最典型的半金属类型。与其他拓扑材料(如拓扑和陈数绝缘体)类似,拓扑半金属具有拓扑保护的线性色散表面态。与拓扑绝缘体中的螺旋表面态不同,韦伊尔半金属的表面态是手性的,类似于陈数绝缘体,这使得韦伊尔半金属可以被视为三维量子霍尔效应区域的类比。由于拓扑表面态中的自旋-动量锁定,韦伊尔半金属对自旋依赖效应也具有吸引力。对于拓扑半金属,传输研究的主要问题是揭示具有无能隙体谱材料中的表面态贡献。本文综述了拓扑半金属中电荷和自旋输运的实验结果:不同超导近邻装置中的电荷输运;自旋依赖输运;拓扑表面态的磁响应;非线性反常霍尔效应作为拓扑半金属中非零 Berry 曲率的直接表现。还考虑了这一新类拓扑材料的潜在应用。

英文摘要

For the solid state physics, recent interest to topological systems is mostly connected with topological semimetals, in particular, to Weyl ones as the most representative semimetal type. Like other topological materials, e.g. topological and Chern insulators, topological semimetals acquire topologically protected surface states with linear dispersion. In contrast to helical surface states in topological insulators, the surface states are chiral for Weyl semimetals, similarly to Chern insulators, which allows to consider Weyl semimetals as the three-dimensional analog of the quantum Hall effect regime. Weyl semimetals are also interesting for spin-dependent effects, due to the spin-momentum locking in the topological surface states. For topological semimetals, the main problem of transport investigations is to reveal the surface states contribution in the material with gapless bulk spectrum. Here, we present review of experimental results on charge and spin transport in topological semimetals: charge transport in different superconducting proximity devices; spin-dependent transport; magnetic response of the topological surface states; non-linear anomalous Hall effect as the direct manifestation of the non-zero Berry curvature in topological semimetals. Possible applications are also considered for this new class of topological materials.

2605.22277 2026-05-22 cs.GT

Joint Communication and Computation Scheduling for MEC-enabled AIGC Services: A Game-Theoretic Stochastic Learning Approach

面向MEC的AIGC服务联合通信与计算调度:一种博弈论随机学习方法

Huaizhe Liu, Xinyi Zhuang, Jiaqi Wu, Yuan Luo, Bin Cao, Lin Gao

AI总结 本文提出了一种基于博弈论的随机学习方法,用于解决MEC赋能的AIGC服务中的联合通信与计算调度问题,通过分布式多智能体随机学习算法实现纳什均衡的高效收敛,从而降低服务完成时间并满足准确性约束。

Comments This manuscript is the online technical report for the paper published on IEEE Internet of Things Journal, 2026

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AI中文摘要

由生成扩散模型(GDMs)驱动的人工智能生成内容(AIGC)已作为一种变革性的范式,用于自动化内容创作。为满足许多边缘智能场景(例如智慧城市)中AIGC服务的严格延迟要求,移动边缘计算(MEC)通过在靠近终端用户的边缘服务器(ES)上部署GDMs提供关键的计算支持。本文研究了一个包含多个ES、无线接入点(APs)和移动用户(UEs)的MEC赋能AIGC网络,这些节点具有异构的延迟和准确性需求。我们提出了一个联合通信关联和计算卸载(JCACO)博弈,其中每个UE战略性地选择其服务AP、ES和推理步骤,以最小化整体服务完成时间并满足准确性约束。由于网络动态性和不完全信息,该问题具有挑战性。我们证明在完全和随机信息设置下,JCACO博弈是一个潜在博弈,确保在两种情况下都存在纳什均衡(NE)。为了高效推导NE,我们开发了一种分布式多智能体随机学习(MASL)算法,该算法可以证明收敛到NE并具有严格的表现保证。与传统最佳响应方案不同,MASL不需要其他玩家策略的知识或全局网络信息,使其完全分布式且适应动态环境。我们进一步通过使用常微分方程(ODEs)对MASL进行严格的理论收敛分析。仿真结果表明,与基准方法相比,MASL显著减少了服务完成时间,同时满足准确性约束,证实了其在实际MEC赋能AIGC网络中的有效性与实用性。

英文摘要

Artificial Intelligence Generated Content (AIGC) powered by Generative Diffusion Models (GDMs) has emerged as a transformative paradigm for automated content creation. To satisfy the stringent latency requirements of AIGC services in many edge intelligence scenarios (e.g., smart cities), Mobile Edge Computing (MEC) provides critical computational support by deploying GDMs at edge servers (ES) close to end users. This paper investigates an MEC-enabled AIGC network comprising multiple ES, wireless access points (APs), and mobile users (UEs) with heterogeneous latency and accuracy demands. We formulate a Joint Communication Association and Computation Offloading (JCACO) game, where each UE strategically selects its serving AP, ES, and inference steps to minimize the overall service completion time while meeting accuracy constraints. The problem is challenging due to the network dynamics and the incomplete information. We prove that the JCACO game is a potential game under both complete and stochastic information settings, ensuring the existence of Nash Equilibrium (NE) in both cases. To derive the NE efficiently, we develop a distributed Multi-Agent Stochastic Learning (MASL) algorithm that provably converges to the NE with strict performance guarantees. Unlike conventional best-response schemes, MASL requires neither the knowledge of other players' strategies nor global network information, making it fully distributed and adaptive to dynamic environments. We further provide a strict theoretical convergence analysis for MASL by using Ordinary Differential Equations (ODEs). Simulation results demonstrate that MASL significantly reduces service completion time compared with benchmark methods while satisfying accuracy constraints, confirming its effectiveness and practicality for real-world MEC-enabled AIGC networks.

2605.22274 2026-05-22 physics.flu-dyn physics.comp-ph

A unified gas-kinetic wave-particle method for multiscale binary-species gas mixtures

一种统一的气体-动能波-粒子方法用于多尺度二元气体混合物

Junzhe Cao, Yufeng Wei, Wenpei Long, Chengwen Zhong, Kun Xu

AI总结 本文提出了一种统一的气体-动能波-粒子方法,用于模拟多尺度二元气体混合物,通过直接建模离散空间,自动将气体分布函数分解为分析流体波和离散粒子,分别描述其近平衡和非平衡部分,该方法在模拟各种多尺度物理现象如高超声流、等离子体输运和辐射输运中具有显著优势。

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AI中文摘要

本文提出了一种统一的气体-动能波-粒子(UGKWP)方法,用于模拟多尺度二元气体混合物。得益于在离散空间中的直接建模,UGKWP方法能够自动将气体分布函数分解为分析流体波和离散粒子,分别描述其近平衡和非平衡部分。该方法在模拟各种多尺度物理现象,如高超声流、等离子体输运和辐射输运中具有显著优势。在本研究中,我们采用Groppi等人[EPL, 96 (2011) 64002]提出的模型计算局部目标平衡分布函数的宏观速度和温度,从而在连续流 regime 中恢复正确的粘度和扩散系数。为解决热传导系数,采用Shakhov模型来修正普朗特数。扩散效应不仅通过操作符分裂方法体现在源项中,还通过特征积分解法体现在通量演化中,同时严格保持波和粒子描述之间的一致性。此外,通过利用物理上修正的碰撞时间来确定高速粒子的自由运输时间,改进了微观模型。通过一系列从连续到稀疏区域的数值测试,所提出的UGKWP方法被证明能够准确捕捉不同物种之间的速度和温度差异。值得注意的是,对于高超声流,预测的壁面压力、剪切应力和热流系数与DSMC结果一致。

英文摘要

This paper presents a unified gas-kinetic wave-particle (UGKWP) method for simulating multiscale binary-species gas mixtures. Benefiting from direct modeling in a discretized space, the UGKWP method enables the automatic decomposition of the gas distribution function into analytical hydrodynamic waves and discrete particles, which respectively describe its near-equilibrium and non-equilibrium parts. This approach offers significant advantages for simulating various multiscale physical phenomena, such as hypersonic flows, plasma transport, and radiation transport. In this study, we employ the model proposed by Groppi et al. [EPL, 96 (2011) 64002] to calculate the macroscopic velocity and temperature of the local target equilibrium distribution function, thereby recovering the correct viscosity and diffusion coefficients in the continuum flow regime. To address the heat conduction coefficient, the Shakhov model is incorporated to correct the Prandtl number. Diffusion effects are accounted for not only in the source term via an operator-splitting method, but also in the flux evolution through the characteristic integral solution, while strictly maintaining consistency between the wave and particle descriptions. Furthermore, the microscopic model for high-speed particles is improved by utilizing a physically corrected collision time to determine their free-transport time. Through a series of numerical tests spanning the continuum to rarefied regimes, the proposed UGKWP method is shown to accurately capture the differences in velocity and temperature between different species. Notably, for hypersonic flows, the predicted wall pressure, shear stress, and heat flux coefficients agree well with DSMC results.

2605.22270 2026-05-22 physics.optics

Refractive index retrieval of 3D printed materials for photonic applications

用于光子应用的3D打印材料的折射率检索

Joseph Arnold Riley, Christian Johnson-Richards, Noel Healy, Victor Pacheco-Peña

AI总结 本文通过理论和实验方法评估了四种聚合物的复折射率,包括一些回收版本,以确定它们在电信波长下的光子应用潜力。

Comments 23 pages, 6 figures

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AI中文摘要

增材制造的出现为快速原型设计汽车、航空航天应用以及微/纳米尺度的元结构等设备和产品提供了机会。三维打印在电磁结构、集成光学和光子系统中变得相关,但商用3D打印聚合物在电信波长(1550nm)下的光学特性并不总是可用。鉴于3D打印技术的重要性,本文在理论上和实验上评估了四种聚合物(包括一些回收版本,即丁烯醇乙烯(BVOH)、聚乳酸(PLA)、回收聚对苯二甲酸乙二醇酯(rPET)和回收聚乳酸(rPLA))的复折射率,作为光子应用的候选材料。3D打印样品的厚度从约100至400纳米(分别对应约64波长至258波长)。实验提取的反射率和透射率光谱用于检索每种打印材料的复折射率,显示出在1550nm波长下的消光系数在10^-4数量级。实验结果通过数值模拟验证。最后,作为概念验证,设计并评估了凸面平面透镜和布拉格镜,展示了所提出聚合物在电信波长下制造3D光子结构的潜力。

英文摘要

The advent of additive manufacturing has opened opportunities to rapidly prototype devices and products ranging from automotive and aerospace applications to micro/nanoscale metastructures, as examples). Three-dimensional (3D) printing has become relevant for electromagnetic structures, integrated optics and photonics systems, however, the optical properties of commercially available 3D printed polymers at telecommunication wavelengths (wavelength 1550nm) is not always available. Provided the importance of 3D printing technologies, in this work, we evaluate both theoretically and experimentally the complex refractive index of four polymers including some recycled versions (namely Butenediol Vinyl Alcohol (BVOH), Polylactic Acid (PLA), Recycled Polyethylene Terephthalate (rPET), and recycled Polylactic Acid (rPLA)) as potential candidates for photonics applications. The 3D printed samples have thicknesses from ~100 to 400 nm (~64wavelengths to ~258wavelengths, respectively). The experimental reflectance and transmittance spectra are extracted and used to retrieve the complex refractive index of each printed material demonstrating extinction coefficients in the order of 10^-4 at wavelength=1550nm. The experimental results are validated using numerical simulations. Finally, as a proof-of-concept, a convex-planar lens and a Bragg mirror are designed and numerically evaluated, showing the potential of the proposed polymers for 3D printing photonic structures at telecommunication wavelengths.

2605.22267 2026-05-22 quant-ph

Emulation of Optically Interconnected Quantum Data Centers Topologies for Cost-Fidelity Benchmarking

量子数据中心拓扑结构的光互连仿真用于成本-保真度基准测试

Seyed Navid Elyasi, Seyed Morteza Ahmadian, Rui Lin, Paolo Monti

AI总结 本文通过量子计算机仿真了环形、星形和线形光互连量子处理器拓扑结构,发现星形结构在传输和光纤噪声下提供了最佳的成本与保真度平衡。

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AI中文摘要

我们使用量子计算机仿真了环形、星形和线形拓扑结构的光互连量子处理器。GHZ基准测试显示,在传输和光纤噪声条件下,星形结构在成本和保真度之间提供了最佳的折衷方案。

英文摘要

We emulate optically interconnected quantum processors in ring, star, and line topologies using a quantum computer. GHZ benchmarks show that the star provides the best trade-off between cost and fidelity under transduction and fiber noise.

2605.22264 2026-05-22 quant-ph math.OA

Statistical Interpretation of the Procedures Measurement of Physical Quantities

物理量测量程序的统计解释

Pandiscia Carlo

AI总结 本文通过重新组织和综合现有模型,提出量子物理基础的框架,强调实验可行程序和实验室实践的统计模型,为量子力学的公理化重述提供基础。

Comments These notes were completed with the assistance of the DeepSeek artificial intelligence system, which was used for linguistic revision, grammar correction, and textual improvement

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AI中文摘要

本文发展了一个概念框架,用于量子物理基础的理论,将代数方法和量子概率联系起来。文章不提出新的公理或理论,而是重新组织和综合现有模型,强调其假设、概念结构和操作意义。分析从冯·诺依曼的测量理论及其后续发展开始,如麦凯的贡献,强调实验可行程序的重要性以及需要基于实验室实践的统计模型。文章采用操作视角,认为物理量仅通过实验测量方法定义,相应的概率测度由测量结果推导。文章批判性地检验了纯数学化方法(如代数方法)脱离实验解释时的局限性。文章主张明确区分公理、公设和前提,并重建量子理论,使其既符合经验限制又保持概念清晰。总体目标是提供从操作原则到代数结构的连贯路径,为量子力学的公理化重述提供基础,使其忠实于物理实践。

英文摘要

This work develops a conceptual framework for the foundations of quantum physics, linking two main approaches: the algebraic formulation and quantum probability. Rather than proposing new axioms or theories, the text reorganizes and synthesizes existing models, highlighting their assumptions, conceptual structures, and operational significance. The analysis begins with von Neumann's measurement theory and its subsequent developments by Mackey, emphasizing the role of experimentally feasible procedures and the need for a statistical model grounded in laboratory practice. The work adopts an operational perspective, according to which physical quantities are defined solely through experimental measurement methods, and the corresponding probabilistic measures are derived from measurement outcomes. The introduction critically examines the limitations of purely mathematical formulations - such as the algebraic method - when separated from experimental interpretation. The text argues for a clear distinction between axioms, postulates, and presuppositions, and for a reconstruction of quantum theory that respects both empirical constraints and conceptual clarity. Overall, the goal is to provide a coherent path from operational principles to algebraic structures, offering a basis for an axiomatic reformulation of quantum mechanics that remains faithful to physical practice.

2605.22261 2026-05-22 cs.IT math.IT

Information-Theoretic Decentralized Secure Aggregation with User Dropouts

信息论视角下的去中心化安全聚合与用户丢失

Zhou Li, Xiang Zhang, Yizhou Zhao, Han Yu, Giuseppe Caire

AI总结 本文研究了在用户丢失情况下信息论视角下的去中心化安全聚合的基本限制,提出了一种两轮通信协议,在用户丢失和合谋情况下,通过构造相关秘密密钥实现安全聚合,并证明了最优通信速率区域。

Comments submitted to IEEE TCOM

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AI中文摘要

本文研究了在用户丢失情况下信息论视角下的去中心化安全聚合的基本限制。我们考虑了一个完全去中心化的网络,其中K个用户通过广播信道通信,没有可信的聚合服务器。每个用户持有私有输入,并旨在恢复存活用户输入的总和(用户可能丢失),同时确保即使该用户与其他用户合谋,也不会泄露关于个体输入的额外信息。考虑了一种两轮通信协议,假设至少U个用户存活,且每个用户最多可以与其他T个用户合谋。在此设置中,最优通信速率区域被完全表征:我们证明如果U≤T+1,则DSA不可行;否则,最优速率区域由R₁≥1和R₂≥1/(U-T-1)给出,其中R₁和R₂分别表示第一轮和第二轮通信速率。所提出的聚合方案基于由(T+1)个私有最大距离可分离(MDS)矩阵构造的相关秘密密钥,同时提供了对用户丢失和合谋的鲁棒性。我们还推导了紧致的反向界限,以证明所提出方案的最优性。我们的结果表明,最优的第二轮通信速率仅取决于有效的冗余水平U-T-1,而与总用户数无关。

英文摘要

This paper investigates the fundamental limits of information-theoretic decentralized secure aggregation (DSA) with user dropouts. We consider a fully decentralized network where $K$ users communicate over broadcast channels without a trusted aggregation server. Each user holds a private input and aims to recover the sum of the surviving users' inputs (users may drop) while ensuring that no additional information about individual inputs is revealed to that user, even if it can collude with other users. A two-round communication protocol is considered, where we assume at least $U$ users survive and each user can collude with at most $T$ other users. For this setting, the optimal communication rate region is fully characterized: we show that DSA is infeasible if $U\le T+1$; otherwise, the optimal rate region is given by $R_1\geq 1$ and $R_2\geq \frac{1}{U-T-1}$, where $R_1$ and $R_2$ denote the first- and second-round communication rates, respectively. The proposed aggregation scheme is based on correlated secret keys constructed from $(T+1)$-private maximum distance separable (MDS) matrices, which simultaneously provide robustness against user dropouts and security against collusion. We also derive tight converse bounds that establish the optimality of the proposed scheme. Our result shows that the optimal second-round communication rate depends only on the effective redundancy level $U-T-1$ regardless the total number of users.

2605.22260 2026-05-22 physics.hist-ph gr-qc

The Limitations of the Notion of `Observable' in Diffeomorphism-Invariant Models

可观察性概念在差分同胚不变模型中的局限性

Álvaro Mozota Frauca

AI总结 本文探讨了将规范理论中的`可观察性`概念应用于差分同胚不变理论(尤其是广义相对论)时所遇到的概念和技术问题,指出可观察性更自然地出现在局部规范变换的意义下,并论证差分同胚不变性只能从全局视角视为规范对称性,从而限制了可观察性的应用范围。

Comments Accepted for publication at \textit{The British Journal for Philosophy of Science}. Preprint of May 2026. Please cite published version when available

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AI中文摘要

将规范理论中的`可观察性`概念应用于差分同胚不变理论——尤其是广义相对论——时,在解释具有这种对称性的经典理论并构建其量子版本时引发了诸多概念和技术问题。本文区分了规范变换的两种意义:局部和全局,并论证可观察性概念更自然地出现在局部规范变换的意义下。然后,我论证差分同胚不变性只能从全局视角被视为规范对称性,因此可观察性的概念仅在有限范围内适用。这导致一些文献中的流行主张,如差分同胚不变模型的物理内容编码在相关性中的说法,是站不住脚的。

英文摘要

The application of the notion of `observable' from gauge theory to diffeomorphism-invariant theories -- most relevantly to general relativity -- has led to numerous conceptual and technical issues when interpreting classical theories with this symmetry and building quantum versions of them. In this article I distinguish between two senses of gauge transformation: local and global, and I argue that the notion of observable appears more naturally in the local sense of gauge transformation. Then, I argue that diffeomorphism invariance can be understood as a gauge symmetry only from a global point of view, and hence, that the concept of observable applies only in a restricted manner. This has the consequence that some popular claims in the literature, such as the claim that the physical content of diffeomorphism-invariant models is encoded in correlations, are unfounded.

2605.22253 2026-05-22 stat.ME

Bayesian Nonparametrics: Principles and Practice

贝叶斯非参数方法:原理与实践

Nils Lid Hjort, Chris Holmes, Peter Mueller, Stephen G. Walker

AI总结 本文探讨了贝叶斯非参数方法的核心原理和实际应用,介绍了该领域的发展背景、历史以及未来的研究方向。

Comments 16 pages, no figures. This is the authors' extended preface to and published in modified form in the book Bayesian Nonparametrics, Cambridge University Press, 2010, sketching the history of Bayesian Nonparametrics, pointing to developments and application domains, etc

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AI中文摘要

本前言[针对《贝叶斯非参数方法》一书,剑桥大学出版社,2010年出版,由NL Hjort, CC Holmes, P Mueller, SG Walker所著]旨在解释为何你对贝叶斯非参数方法感到好奇是正确的——为什么你实际上可能需要它,以及如何理解和使用它。前言也作为引言章节,概述了本书的目标和内容。我们还解释了这本书为何诞生的背景,简要回顾了仍相对年轻的贝叶斯非参数领域的历史,并提供了一些结论性的评论,涉及该领域的各种挑战和可能的未来发展方向。

英文摘要

This extended preface [to the Book `Bayesian Nonparametrics', Cambridge University Press, 2010, by NL Hjort, CC Holmes, P Mueller, SG Walker] is meant to explain why you are right to be curious about Bayesian nonparametrics -- why you may actually need it and how you can manage to understand it and use it. The preface also serves as an introductory chapter, giving an overview of the aims and contents of the book. We also explain the background for how the book came into existence, delve briefly on the history of the still relatively young field of Bayesian nonparametrics, and offer some concluding remarks, pertaining to various challenges and likely future developments of the area.

2605.22251 2026-05-22 math.OC cs.SY eess.SY

Online Optimization with Unknown Time-Varying Parameters from Noisy Gradient Measurements

具有未知时间变化参数的在线优化(基于噪声梯度测量)

Shivanshu Tripathi, Maziar Raissi

AI总结 研究在线优化问题,其中成本函数依赖于不可测的时间变化参数,通过控制理论工具从梯度观测中重建潜在参数,使用工具变量估计参数动态,并预测参数以计算未来最小值,提供预期跟踪误差的界。

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AI中文摘要

我们研究在线优化问题,其中成本函数依赖于不可测的时间变化参数,这些参数由未知动态控制。具体而言,我们考虑一个强凸成本函数,其线性项按照未知的线性随机动态演变,而算法只能获取有限的噪声梯度测量。我们提出了一种解决方案,利用控制理论工具从梯度观测中使用高斯-马尔可夫估计器重建潜在参数,然后使用工具变量估计器识别参数动态,并最终预测参数以计算未来最小值。我们提供了预期跟踪误差的界。我们通过一系列数值示例展示了算法的有效性。

英文摘要

We study online optimization problems in which the cost function depends on latent, time-varying parameters that are unmeasurable and governed by unknown dynamics. Specifically, we consider a strongly convex cost function whose linear term evolves according to unknown linear stochastic dynamics, while the algorithm has access only to finite noisy gradient measurements. We propose a solution that uses control theoretic tools to reconstruct the latent parameters from gradient observations using a Gauss-Markov estimator, then identifies the parameter dynamics using an instrumental-variable estimator, and finally forecasts the parameters to compute the future minimizer. We provide a bound on the expected tracking error. We illustrate the effectiveness of our algorithm on a series of numerical examples.

2605.22250 2026-05-22 math.AG

A question on klt type varieties of Han and Jiang

关于汉和江提出的klt型品种的问题

Jihao Liu

AI总结 本文证明了klt型性质在平坦族中不是开条件,回答了汉和江提出的问题,其构造主要使用了生成式人工智能技术。

Comments 4 pages. AI generated, human verified

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AI中文摘要

我们证明了在平坦族的品种中,klt型性质不是开条件。这回答了汉和江提出的问题。本文的构造很大程度上利用了生成式人工智能:反例的一般想法由ChatGPT Pro 5.5提出,而具体的例子则由Rethlas系统找到并证明。

英文摘要

We prove that being of klt type is not an open condition in flat families of varieties. This answers a question of Han and Jiang. The construction in this paper substantially uses generative AI: the general idea for the counterexample was suggested by ChatGPT Pro 5.5, and the explicit example was found and proved by the Rethlas system.

2605.22246 2026-05-22 physics.optics

Single-pump hybrid nonlinearities in transparent conductors

透明导体中的单泵混合非线性效应

Wallace Jaffray, Sven Stengel, Alexandra Boltasseva, Vladimir M. Shalaev, Carlo Rizza, Domenico de Ceglia, Maria Antonietta Vincenti, Michael Scalora, Matteo Clerici, Marcello Ferrera

AI总结 本研究通过单个强近红外泵浦光激发透明导体,实现了内在带和跨带非线性效应,揭示了谐波产生而非直接多光子吸收是跨带非线性效应的来源,为超快光子操控提供了新方法。

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AI中文摘要

低折射率透明导电氧化物因其在这些材料中可以诱导出极大的时间折射率梯度而受到广泛关注。由于这种显著的非线性光学行为,这种材料平台能够实现皮秒级的所有光学控制,对集成光子学、量子光学和光学计算具有越来越重要的意义。由于其混合电子结构,透明导体表现出内在带和跨带非线性效应,此前通过双色激发(近红外和紫外泵浦)来实现。在这里,我们证明,这两种激发机制可以通过单一强近红外泵浦来激活。在阈值强度以上,泵浦驱动热电子内在带动力学,同时产生高阶谐波,触发跨带激发。这两种效应的相互作用使记录的透射率的时间特征更加清晰,从而显著拓宽了有效材料带宽。最后,通过比较线性和圆极化泵浦条件,我们进一步证明,观察到的跨带非线性效应源于谐波产生而非直接多光子吸收。我们的结果为这些时间变化的光子材料中的强场光学响应提供了关键见解,为在经典和量子领域中超快操控光子开辟了新前景。

英文摘要

Low-index transparent conducting oxides have attracted significant attention because ultrafast optical excitation in these materials can induce exceptionally large temporal index gradients. Due to this remarkable nonlinear optical behaviour, this material platform enables sub-picosecond, all-optical control of photon energy and momentum, with growing relevance for integrated photonics, quantum optics, and optical computation. Owing to their hybrid electronic structure, transparent conductors exhibit both intraband and interband nonlinearities, previously accessed using dual-colour excitation with near-infrared and ultraviolet pumps. Here, we show that both excitation regimes can be activated using a single, intense near-infrared pump. Above a threshold intensity, the pump drives hot-electron intraband dynamics while simultaneously generating higher harmonics that trigger interband excitation. The interplay of these two effects sharpens the temporal features of the recorded transmissivity which in turn substantially broadens the effective material bandwidth. Finally, by comparing linear and circular pumping conditions, we further demonstrate that the observed interband nonlinearities originate from harmonic generation rather than from direct multiphoton absorption. Our results provide key insights into the strong-field optical response in these time-varying photonic materials, opening new frontiers for the ultra-fast manipulation of photons in both classic and quantum regimes.

2605.22245 2026-05-22 hep-ph astro-ph.CO astro-ph.HE

Probing freeze-in dark matter using Bose-Einstein condensate in neutron star

通过中子星中的玻色-爱因斯坦凝聚探测冻结入暗物质

Deep Ghosh, Anirban Das

AI总结 本文研究了中子星中玻色-爱因斯坦凝聚如何增强暗物质湮灭率,从而提高中子星表面温度,使詹姆斯·韦伯太空望远镜能够探测到暗物质与核子的散射截面,并补充地面上的直接探测搜索。

Comments 25 pages, 7 figures

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AI中文摘要

中子星(NS)是探测暗物质(DM)与可见物质非引力相互作用最具有前景的天体物理目标之一。其紧凑性使其成为一种理想的对象,可以利用暗物质-核子散射截面在其生命周期内高效捕获粒子暗物质。如果暗物质粒子是玻色子,那么捕获的暗物质粒子可能在中子星中心形成玻色-爱因斯坦凝聚,显著增加暗物质密度。在本文中,我们研究了这种场景的现象学,由于凝聚体中密度的增加,暗物质湮灭率得到增强。增强的暗物质湮灭使中子星表面比标准冷却情景下更热。我们证明,如果暗物质形成凝聚体,湮灭率会提高一个数量级为$\mathcal{O}(10^{15}-10^{20})$的因子,且暗物质具有冻结入湮灭截面时可以将中子星加热到更高的温度,使其处于詹姆斯·韦伯太空望远镜的探测范围内。此外,这还使我们能够探测暗物质-核子散射截面,这将补充地面上的直接探测搜索。此外,凝聚体增强的湮灭改变了捕获-湮灭平衡和中子星内部黑洞形成下限的s波暗物质湮灭截面。最后,我们展示了一个标量暗物质模型的例子,其中这样的小湮灭和暗物质-核子散射截面可以普遍出现。

英文摘要

Neutron star (NS) is one of the most promising astrophysical targets to probe non-gravitational interaction of dark matter (DM) with visible matter. Their compactness makes them an ideal object which can capture particle DM efficiently over its lifetime using the DM-nucleon scattering cross-section. If DM particles are bosonic, then the captured DM population may form a Bose-Einstein condensate at the center of the NS, increasing the DM density significantly. In this work, we study the phenomenology of such scenario with enhanced DM annihilation rate due to the increased density in a condensate. The enhanced DM annihilation makes the NS surface `hotter' than in the standard cooling scenario. We show that the annihilation rate is enhanced by a factor of $\mathcal{O}(10^{15}-10^{20})$ if DM forms a condensate, and DM with freeze-in value annihilation cross-section can heat up the NS to higher temperatures, bringing it within the reach of James Webb Space Telescope. It also allows us to probe DM-nucleon scattering cross section within the neutrino fog regime which will complement the terrestrial direct detection searches. Moreover, the enhanced annihilation from the condensate changes the lower limits on s-wave DM annihilation cross-section for capture-annihilation equilibrium and the formation of a black hole inside the NS. Finally, we show an example of a scalar DM model where such small annihilation and DM-nucleon scattering cross sections can generically arise.

2605.22244 2026-05-22 math.DS

Equality of the dynamical sets of two commuting transcendental entire functions

两个可交换超越整函数的动力学集合相等

Manisha Kumari, Dinesh Kumar

AI总结 本文研究了两个可交换的超越整函数f和g的动力学性质,其中g的形式为af^p + b,其中a,b∈C,p∈N,且a≠0,1。研究发现f和g的逃逸集、填充Julia集和蹦床集都相同。作为直接结果,我们得出f和g的Julia集相同。该定理扩展了Poon和Yang1998年的结果。此外,遵循Wang和Yang的研究,我们考虑了一个非常数多项式Q和可交换的整个函数f和g,满足关系Q(g)=aQ(f)+b,其中a≠0,1,b∈C。在更一般的情况下,我们证明了f和g的逃逸集、填充Julia集和蹦床集相等。

Comments 8 pages. Comments are welcome

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AI中文摘要

在本文中,我们研究了可交换的超越整函数f和g的动力学,其中g的形式为af^p + b,其中a,b∈C,p∈N,且a≠0,1。我们证明了f和g的逃逸集、填充Julia集和蹦床集都相同。作为直接结果,我们特别得出f和g的Julia集相同。我们的定理扩展了Poon和Yang1998年的结果。此外,遵循Wang和Yang的研究,我们考虑了一个非常数多项式Q和可交换的整个函数f和g,满足关系Q(g)=aQ(f)+b,其中a≠0,1,b∈C。在更一般的情况下,我们证明了f和g的逃逸集、填充Julia集和蹦床集相等。

英文摘要

In this paper, we study the dynamics of commuting transcendental entire functions $f$ and $g$, where $g$ is of the form $af^p + b$ with $a,b \in \C$, $p \in \N$, and $a \neq 0,1$. We establish that the escaping sets, filled Julia sets, and bungee sets of $f$ and $g$ all coincide. As an immediate consequence, we obtain in particular that the Julia sets of $f$ and $g$ are identical. Our theorem extends the 1998 result of Poon and Yang. Furthermore, following Wang and Yang, we consider a non-constant polynomial $Q$ and permutable entire functions $f$ and $g$ satisfying the relation $Q(g)=aQ(f)+b$, where $a(\neq 0,1), b \in \C$. In this more general setting, we also prove that the escaping sets, filled Julia sets, and bungee sets of $f$ and $g$ are equal.

2605.22241 2026-05-22 math.CO

Combinatorics and Asymptotics of Positive Systems of Linear Catalytic Equations

组合学与正线性催化方程的渐近分析

Cyril Banderier, Michael Drmota

AI总结 本文研究了一类出现在格路计数和可排序排列计数中的正线性催化方程的组合学和渐近性质,证明了生成函数满足正多项式方程并具有普遍的渐近行为。

Comments 22 pages

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AI中文摘要

我们对出现在多个组合问题中的正线性方程组进行了完整的组合学和渐近分析,这些方程组包含一个催化变量。我们证明相应的生成函数满足一个正多项式方程(与一个上下文无关的文法相关)。此外,我们证明了普遍的渐近行为。

英文摘要

We provide a complete combinatorial and asymptotic analysis of positive linear systems of equations in one catalytic variable that appear in several combinatorial problems such as in lattice path counting or stack-sortable permutation counting. We show that the corresponding generating functions satisfy a positive polynomial system of equations (which is associated to a context-free grammar). Furthermore we prove a universal asymptotic behaviour.

2605.22239 2026-05-22 cs.SE

An Architecture for Decentralised Deployment and Operation of Blockchain Applications

一种去中心化部署和操作区块链应用的架构

Fabian Stiehle, Kirill Inozemtsev, Ingo Weber

AI总结 本文提出了一种将DevOps最佳实践与去中心化自治组织(DAO)概念相结合的新架构,旨在支持确定性部署并简化区块链应用的去中心化操作流程。

Comments Accepted at the European Conference on Software Architecture (ECSA) 2026

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AI中文摘要

区块链和分布式账本技术允许运行多种去中心化应用(dApps)。此类应用基于智能合约,是一种可编程抽象,以去中心化方式执行。为了确保智能合约的正确性,区块链应用开发者依赖DevOps实践,如自动化测试和持续集成和部署。然而,此类基础设施通常由单一实体控制。对于较大的区块链应用,此问题通过依赖去中心化自治组织(DAO)的概念来解决,该机制允许在达到预定义多数时自动执行提案。此类治理架构复杂,需要与现有合同发现和可升级性模式进行整合。在本文中,我们整合这些概念并考虑DevOps最佳实践,提出了一种新的架构,该架构对不同的治理和升级实现保持中立。我们扩展了已知的注册模式以支持确定性部署,并提出了一个去中心化部署框架,包括整合和部署流水线、用户界面和版本控制整合。在我们的方法中,每个参与方在使用(新部署的)智能合约之前都会实施并验证自己的测试。我们提供了一个参考实现,作为开源代码,并对提案进行了彻底评估。我们的架构可作为未来整合的参考,而我们的开源框架旨在减少在实践中采用此类流程的复杂性。

英文摘要

Blockchains and distributed ledger technologies allow the operation of manifold decentralised applications (dApps). Such applications are based on smart contracts, a programmable abstraction that is executed in a decentralised manner. To ensure the correctness of smart contracts, blockchain application developers rely on DevOps practices such as automated testing and continuous integration and deployment. However, such infrastructure is often controlled by single entities. For larger blockchain applications, this issue is resolved by relying on concepts of Decentralised Autonomous Organisations (DAOs), which allow proposals to be autonomously executed once they reach a pre-defined quorum. Such a governance architecture is complex and requires integration with existing patterns for contract discovery and upgradeability. In this paper we integrate these concepts considering DevOps best-practices into a novel architecture that remains agnostic to different governance and upgrade implementations. We extend the known registry pattern to support deterministic deployments and present a decentralised deployment framework, including integration and deployment pipelines, user-interfaces, and version control integration. In our approach, each party implements and verifies their own tests before engaging in the use of a (newly deployed) smart contract. We provide a reference implementation, available as open-source, and evaluate the proposal thoroughly. Our architecture can serve as a reference for future integrations, while our open-source framework is aimed at reducing the complexity of adopting such a process in practice.

2605.22234 2026-05-22 cond-mat.mtrl-sci

Virp: neural network-accelerated prediction of physical properties in site-disordered materials

Virp: 基于神经网络的位点无序材料物理性质预测

Andy Paul Chen, Martin Hoffmann Petersen, Kedar Hippalgaonkar

AI总结 本文提出了一种结合排列虚拟单元生成算法、采样方案和热力学后处理的管道,用于高效分析位点无序材料的物理性质,通过使用400个虚拟单元可充分采样大规模构型空间。

Comments 19 pages, 6 figures

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AI中文摘要

在金属合金、陶瓷以及常见的水冰等材料中,晶态秩序通常以概率形式出现。在这种情况下,晶体中的一个或多个位点可能被多种元素或空位占据,根据一组概率。这些晶体结构仍然无法被常规的第一性原理材料模拟方法所处理,因为这些方法假设晶体秩序是完美的。为解决这一限制,我们提出了一个结合基于排列的虚拟单元生成算法、采样方案和热力学后处理的管道,大大提高了对位点无序材料的计算分析可行性。我们证明,只要超单元定义足够大,400个虚拟单元就足以充分采样大规模构型空间。

英文摘要

Among metallic alloys, ceramics, and even common compounds such as water ice, it is usual to find materials in which crystalline order is expressed as a probability. In such cases, one or more sites within a crystal can be occupied by multiple elements or vacancies, according to a set of probabilities. These crystal structures remain inaccessible to common first-principles materials simulation methodologies, which assumes perfect crystal order. Workaround strategies to this limitation include quasirandom structures and cluster expansion. These methods are system-specific and computationally expensive as they rely on large scale Monte Carlo simulations of enlarged unit cells. To address these limitations, we propose a pipeline combining a permutation-based virtual cell generation algorithm, sampling regime, and thermodynamic post-processing which greatly improves the feasibility of computation analyses for site-disordered materials. We demonstrate that the massive configurational space can be adequately sampled with 400 virtual cells, as long as the supercell definition is sufficiently large.

2605.22233 2026-05-22 astro-ph.SR

A Robust Deep Learning Framework for Prominence Detection through Composite Feature Representations

一种通过复合特征表示进行突出检测的鲁棒深度学习框架

Harry Birch, Stéphane Régnier, Richard Morton

AI总结 本文提出了一种鲁棒的深度学习框架,通过复合特征表示来检测日珥,解决了由于EUV HeII 304 Å通道的热日冕发射造成的模型性能问题,并展示了在高时间分辨率数据上的应用价值。

Comments 16 pages, 6 figures

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Journal ref
ApJ 1003 104 (2026)
AI中文摘要

日珥是悬挂在日冠中的动态结构,是太阳活动的表现。其演化包括与日冕物质抛射相关的爆发,因此其检测对于空间天气监测和预测至关重要。SDO/AIA等任务提供的大量高时间分辨率数据推动了能够处理大规模数据集的深度学习框架的应用。然而,先前的研究报告了由于EUV HeII 304 Å通道的热日冕发射造成的模型性能不佳。使用现有的标记日珥数据集,我们发现训练后的YOLOv5目标检测模型对304 Å颜色映射存在强烈偏见,而不是物理上有意义的日珥特征。我们开发了两个进一步的模型,由原始数据预处理管道构建的三通道图像:(i) 全盘灰度、全盘增强日冠和去盘,(ii) 与(i)相同但所有去盘图像。我们的管道校正了仪器退化,以在太阳周期内保持更一致的特征表示。复合模型(i)在测试集上实现了mAP@50为0.749和78%的召回率,优于先前的边界框方法。对复合模型的视觉分析显示,许多明显的假阳性是有效的未标记日珥。我们还通过在SUVI图像数据上测试复合模型来展示跨仪器的泛化能力。通过检查传播到模型预测中的数据集偏见,我们提供了数据集构建的建议。我们提出了一种可靠、物理驱动且多功能的深度学习模型,用于自动检测EUV图像中的日珥,为空间天气应用提供了一个有用的框架。

英文摘要

Solar prominences are dynamic structures suspended within the solar corona and are manifestation of solar activity. Their evolution includes eruptions linked to coronal mass ejections, making their detection critical for space weather monitoring and forecasting. The vast amounts of high-cadence data provided by missions such as SDO/AIA motivate the application of deep learning frameworks capable of assimilating large-scale datasets. However, previous studies have reported poor model performance caused by contamination from hot coronal emission from the EUV HeII 304 Å channel. Using an existing labeled prominence dataset, we find that trained YOLOv5 object detection models exhibit a strong bias towards the 304 Å colormap, rather than physically meaningful prominence features. We develop a further two models comprising three-channel images constructed through an original dataset preprocessing pipeline: (i) full-disk grayscale, full-disk enhanced corona, and disk-removed, (ii) same as (i) with all disk-removed images. Our pipeline corrects instrument degradation to maintain more consistent feature representations across the solar cycle. The composite model (i) achieves a mAP@50 of 0.749 and a recall of $78\%$ on the test set, outperforming previous bounding box methods. Visual analysis of the composite models reveals that many apparent false positives are valid unlabeled prominences. We additionally demonstrate cross-instrument generalization by testing the composite model on SUVI image data. By examining dataset biases that propagate into model predictions, we provide recommendations for robust dataset construction. We present a reliable, physically-motivated, and versatile deep learning model to automatically detect prominences in EUV images, providing a framework beneficial for space weather applications.

2605.22232 2026-05-22 math.CO

Polylogarithmic Bounds for Nested Cycles without Geometric Crossings

对无几何交叉的嵌套循环的多项对数界限

Yue Xu, Jiasheng Zeng, Xiao-Dong Zhang

AI总结 该研究解决了Erdős提出的问题,通过多项对数界限证明了在具有足够多边的图中存在k个边不相交且无几何交叉的嵌套循环。

Comments 15 pages 1 figure

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AI中文摘要

Erdős提出的问题要求极端条件迫使边不相交且具有规定嵌套结构的循环。在几何版本中,嵌套必须相对于循环顺序非交叉。Fernández、Kim、Kim和Liu证明了常数平均度迫使存在两个这样的循环。我们证明了自然多层版本的多项对数界限:对于每个固定的k≥3,每个足够大的n顶点图,如果边数至少为C_k n(log n)^{k-1}(log log n)^{k-3},则包含k个边不相交且无几何交叉的嵌套循环。证明结合了Alon、Bucić、Sauermann、Zakharov和Zamir的鲁棒亚线性扩张框架,以及一个受控包裹引理,允许逐层构建具有受控长度的层。

英文摘要

A problem of Erdős asks for extremal conditions forcing edge-disjoint cycles with a prescribed nested structure. In the geometric version, the nesting is required to be noncrossing with respect to the cyclic orders. Fernández, Kim, Kim and Liu proved that constant average degree forces two such cycles. We prove a polylogarithmic bound for the natural multi-layer version: for every fixed $k\ge 3$, every sufficiently large $n$-vertex graph with at least \[ C_k n(\log n)^{k-1}(\log\log n)^{k-3} \] edges contains $k$ pairwise edge-disjoint nested cycles without geometric crossings. The proof combines the robust sublinear expander framework of Alon, Bucić, Sauermann, Zakharov and Zamir with a controlled wrapping lemma that permits the layers to be built successively with controlled length.

2605.22230 2026-05-22 physics.ins-det

Alpha Background in Multi-Grid Neutron Detectors

多级中子探测器中的α背景

A. Backis, C. -C. Lai, J. R. M. Annand, K. G. Fissum, G. Zuzel, M. Czubak, K. Livingston

AI总结 研究多级中子探测器中来自锕系杂质的α衰变对背景计数率的影响,通过测量放射纯铝及铝/碳化硼复合材料的α衰变率,并发现通过在复合材料上镀镍可显著降低α衰变率,从而减少背景计数率。

Comments 12 figures and text

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AI中文摘要

锕系杂质在铝中的α衰变是多级型热中子探测器中背景计数率的主要来源。通过在大型面积、低背景谱仪上测量用于网格构造的放射纯铝和铝/碳化硼复合材料的α衰变率,发现复合材料的α衰变率比放射纯铝高约280倍,但25μm镍镀层将该速率降低了约1170倍。对两个多级原型的背景计数率进行了比较,两者使用相同的碳化硼涂层、放射纯铝正常叶片作为网格配置,但第一个原型使用放射纯铝作为径向叶片,而第二个原型使用镍镀层的铝/碳化硼作为径向叶片。第二个原型的背景率约为第一个原型的20%。

英文摘要

Alpha emission from actinide impurities in Al is a source of background counting rate in Multi-Grid type detectors of thermal neutrons. The alpha emission rates from samples of radio-purity Al and \mathrm{Al/B_{4}C} composite, used in grid construction, were measured on a large-area, low background spectrometer. Although the alpha emission rate from the composite was a factor \sim280 higher than radio-pure Al, \mathrm{25\:μm} Ni plating of the composite reduced the rate by a factor \sim1170. Background counting rates in two Multi-Grid prototypes were compared. They used identical configurations of \mathrm{B_{4}C}-coated, radio-pure Al normal blades for the grids, but the first employed radio-purity Al for the radial blades, while the second used Ni-plated \mathrm{Al/B_{4}C} on the radial blades. The background rate from the second prototype was around 20% of that from the first.

2605.22229 2026-05-22 cond-mat.mtrl-sci

Delineating the interplay effects of microstructure topology and residual stresses in ultrafast laser irradiated thin films

阐明超快激光照射薄层中微结构拓扑与残余应力的相互作用效应

Hariprasath Ganesan, Stefan Sandfeld

AI总结 本研究通过混合两温度模型-分子动力学模拟,探讨了超快激光照射下金薄层中微结构拓扑、残余应力等因素的复杂相互作用,揭示了微结构配置、拓扑、晶粒尺寸和晶体学取向对激光-金属相互作用的层次影响。

Comments 13 pages, 9 figures

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AI中文摘要

先进纳米设备需要使用超快激光进行高精度薄层加工。然而,薄层制备会导致微结构、晶体学取向和残余应力的变化,这归因于涂层条件和基底选择。本工作通过混合两温度模型-分子动力学模拟,研究了超快激光照射下金(Au)薄层中这些因素的复杂相互作用。我们构建了具有不同晶粒拓扑(随机化 vs. 等轴)、晶粒尺寸和残余拉伸/压缩应力配置的微结构指导原子模型。我们的结果揭示了激光-金属相互作用的明确影响层次:1)微结构配置 2)拓扑 3)晶粒尺寸 4)晶体学取向。在细晶粒薄层中,晶界作为主要熔化前驱体,而局部晶体学取向决定了粗晶粒中的熔化程度。残余拉伸应力促进更高的熔化和更大的激光诱导膨胀,而残余压缩应力则抵抗变形,因为沉积的热能用于克服晶格压缩,导致膨胀减少。我们发现微结构晶粒拓扑和尺寸对薄膜膨胀的影响强于初始缺陷密度。

英文摘要

Advanced nanodevices require high-precision machining of thin films using ultrafast lasers. However, thin-film fabrications cause variations in microstructure, crystallographic orientation, and residual stresses owing to coating conditions and substrate choice. This work investigates the complex interplay between these factors in ultrafast laser-irradiated gold (Au) thin films using a hybrid Two Temperature Model-Molecular Dynamics simulations. We realized microstructure-informed atomistic models with varying grain topologies (randomized vs. equiaxed), grain sizes, and residual tensile/compressive stress configurations. Our results reveal a clear hierarchy of influence on laser-metal interaction: 1.) Microstructure configuration 2.) Topology 3.) Grain Size 4.) Crystallographic orientations. In fine-grained thin films, grain boundaries act as primary melting precursors, while local crystallographic orientation determines the melting extent in coarser grains. Residual tensile stresses contribute to higher melting and greater laser-induced expansion than unstrained films. Conversely, residual compressive stresses resist deformation, as deposited thermal energy is utilized to overcome lattice compression, leading to reduced expansion. We found that microstructure grain topology and size exert a stronger fingerprint on film expansion than the initial defect density.

2605.22227 2026-05-22 cond-mat.mes-hall

Quantum-metric Bloch oscillations in weakly inhomogeneous electric fields

量子度量布洛赫振荡在弱不均匀电场中

M. Maneesh Kumar, Md Kaif Faiyaz, Sayan Sarkar, Amit Agarwal

AI总结 研究在弱不均匀电场中量子度量项对 semiclassical 波包动力学的影响,揭示了即使 Berry 曲率消失时仍存在实空间振荡,并探讨了其输运响应的内在和散射时间依赖部分。

Comments 12 Pages, 4 Figures

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AI中文摘要

迄今为止,研究几何类比的布洛赫振荡主要依赖于 Berry 曲率。我们展示弱不均匀电场会为 semiclassical 波包动力学引入一个独特的量子度量项,即使 Berry 曲率为零,也能产生实空间的振荡贡献。所关联的输运响应包含内在部分和与散射时间相关的部分。在所研究的范围内,后者可能主导,并在保持相对电场不均匀性固定时,在高场时接近有限饱和。倾斜的狄拉克模型展示了该机制。实际平台可能需要合成工程超晶格,具有有限的量子度量和适当的能隙。

英文摘要

Geometric analogs of Bloch oscillations studied so far have relied on Berry curvature. We show that a weakly inhomogeneous electric field adds a distinct quantum-metric term to semiclassical wavepacket dynamics, generating an oscillatory real-space contribution even when the Berry curvature vanishes. The associated transport response comprises an intrinsic and a scattering-time-dependent part. In the regime studied, the latter can dominate and approach finite saturation at high field when the relative field inhomogeneity is held fixed. A tilted Dirac model illustrates the mechanism. Realistic platforms will likely require synthetically engineered superlattices, with a finite quantum metric and an adequate band gap.

2605.22226 2026-05-22 quant-ph

Geometric Construction of Optimal Teleportation Witnesses

最优量子传送见证的几何构造

Yanning Jia, Fenzhuo Guo, Mengxuan Bai, Mengyan Li, Haifeng Dong, Fei Gao

AI总结 本文提出一种几何方法来构造最优量子传送见证,用于判断任意双量子位纠缠态的量子传送有用性,并通过两层迭代切割平面算法解决从目标态到无用态凸集的最短距离问题,从而得到投影点并构造最优见证。

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AI中文摘要

并非所有纠缠态都对量子传送有用。我们提出了一种几何方法来构造最优量子传送见证,这些见证提供了操作性的必要且充分条件,用于识别任意双量子位纠缠态的量子传送有用性。具体来说,通过开发一种两层迭代切割平面算法来解决从目标态ρ到无用态凸集S的最短距离问题,我们得到投影点σ*∈S,然后从投影几何构造最优量子传送见证。此外,此构造过程中获得的最短距离D(ρ)也作为有用性的必要且充分判据。我们应用该方法来识别三类纠缠态的量子传送有用性。

英文摘要

Not all entangled states are useful for quantum teleportation. We present a geometric method to construct optimal teleportation witnesses, which provide operational necessary and sufficient criteria for identifying the teleportation usefulness of arbitrary two-qudit entangled states. Specifically, by developing a two-layer iterative cutting-plane algorithm to solve the shortest distance problem from the target state $ρ$ to the convex set $S$ of useless states, we obtain the projection point $σ^* \in S$ and then construct the optimal teleportation witness from the projection geometry. Moreover, the shortest distance $D(ρ)$ obtained during this construction also serves as a necessary and sufficient criterion for usefulness. We apply our method to identify the teleportation usefulness of three classes of entangled states.

2605.22220 2026-05-22 physics.optics physics.app-ph

OAM Light Demultiplexing from an Intensity Profile using Orthogonality Renormalization of Pair Modes

利用OAM模式正交性归一化实现光束强度剖面的OAM解复用

Junsu Kim, Hyunchae Chun, SeungRyong Park

AI总结 本文提出了一种基于OAM双模态正交性归一化的解复用方法,能够在单强度剖面下实现OAM多通道通信系统的解复用,无需额外光学结构,提高了通信效率和准确性。

Comments 11 pages, 4 figures

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AI中文摘要

光的轨道角动量(OAM)是一种有前景的下一代通信自由度。通过利用OAM模式的正交性,多通道划分使通信性能线性增加,比例于可用模式的数量。然而,每个叠加态的多路复用和解复用仍然是关键且复杂的进程。解复用已通过空间域方法建立,需要额外的光学元件如光栅和孔径,这在各种条件下会降低通信效率和准确性。在本文中,我们提出了一种通过OAM双模态正交性归一化在单强度剖面下实现的解复用方法。该方法可以直接应用于OAM多通道通信系统,而无需额外的接收端光学结构。我们展示了在各种条件下该方法的仿真结果。

英文摘要

Orbital Angular Momentum (OAM) of light is a promising degree of freedom for next-generation communication. By exploiting the orthogonality of OAM modes, multi-channel division enables a linearly increase in communication performance proportional to the number of available modes. However, the multiplexing and demultiplexing of each superposition state remain essential yet complex processes. Demultiplexing has been established through spatial-domain methods that require additional optical elements such as gratings and apertures, which can decrease communication efficiency and accuracy under various conditions. In this paper, we propose a demultiplexing method under a single intensity profile by orthogonality renormalization of OAM pair states. This method can be applied directly to an OAM multichannel communication system without additional receiver-side optical structure. We present simulation results of our method under various conditions.

2605.22218 2026-05-22 quant-ph

Three sins against physics by an exaggerated quantum information perspective

用夸克信息视角曲解物理的三重罪过

Valerio Scarani

AI总结 本文指出量子信息视角可能导致对物理的错误理解,核心方法是批判性分析量子信息理论中的三个误区,主要贡献是揭示这些视角如何扭曲对物理本质的认识。

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AI中文摘要

我指出量子信息视角可能导致对物理的错误理解的三种方式:忘记光不需要量子化就能表现出相干性;忽视单位元演化的生成元;以及将发现自然视为与对手斗争的过程。

英文摘要

I point out three ways in which the perspective of quantum information may lead to distorted claims about physics: forgetting that light does not need to be quantised to show coherence; ignoring the generators of unitary evolutions; and approaching the discovery of nature as a fight against an adversary.

2605.22215 2026-05-22 cs.CE q-fin.CP

A Generative Adversarial Graph Neural Network for Synthetic Time Series Data

一种生成对抗图神经网络用于合成时间序列数据

Marco Gregnanin, Johannes De Smedt, Giorgio Gnecco, Maurizio Parton

AI总结 本文提出Sig-Graph GAN模型,结合时间序列签名、LSTM和图神经网络,通过可视化图算法生成时间序列的图表示,从而在不同股票交易所中更准确地复制对数收益率分布。

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AI中文摘要

生成金融时间序列的合成数据面临挑战,尤其是考虑到其非平稳性质。传统统计时间序列模型通常假设弱平稳性。然而,这一假设可能会限制其有效性。深度学习模型,特别是生成对抗网络(GANs),在模拟复杂概率分布方面表现出极大的潜力。GANs采用生成器-判别器框架,其中生成器创建数据样本,而判别器区分真实数据和生成数据。在本研究中,我们引入了Sig-Graph GAN模型,该模型整合了时间序列签名,提供了一个结构化的时间演变总结;长短期记忆网络(LSTM)捕捉其固有的自回归结构;以及图神经网络(GNNs),利用时间序列数据中的几何模式。为了最优地使用GNNs,我们使用可见图算法来推导时间序列的图表示。数值评估显示,Sig-Graph GAN模型在复制不同股票交易所的对数收益率分布方面优于基线方法。图结构与自回归成分的结合有效捕捉了时间序列数据中嵌入的几何和时间模式。本研究通过引入一个能够利用自回归性质和几何结构的模型,推动了时间序列GAN模型领域的发展。

英文摘要

Generating synthetic data for financial time series poses challenges, especially considering their non-stationary nature. Traditional statistical time series models normally assume weak stationarity. However, this assumption can constrain their effectiveness. Deep learning models, particularly Generative Adversarial Networks (GANs), have exhibited considerable potential in emulating complex probability distributions. GANs employ a generator-discriminator framework, where the generator creates data samples, while the discriminator distinguishes real from generated data. In this research, we introduce the Sig-Graph GAN model, which integrates the time-series signature, offering a structured summary of its temporal evolution; the Long Short-Term Memory network, capturing its inherent autoregressive structure; and Graph Neural Networks (GNNs), leveraging geometric patterns within the time-series data. To employ GNNs optimally, we use the visibility graph algorithm to derive a graph-based representation of the underlying time series. Numerical evaluations demonstrate that the Sig-Graph GAN model outperforms baseline methods in replicating the distribution of logarithmic returns across different stock exchanges. The integration of the graph structure with the autoregressive component effectively captures both geometric and temporal patterns embedded in time-series data. This research advances the field of GAN models for time series by introducing a model capable of leveraging both autoregressive properties and geometric structures for synthetic data generation.

2605.22214 2026-05-22 physics.flu-dyn

N-Component Free Energy Lattice Boltzmann Method with Reduction Consistency and Global Momentum Conservation

N-Component Free Energy Lattice Boltzmann Method with Reduction Consistency and Global Momentum Conservation

Michael Rennick, Xitong Zhang, Tim Niklas Bingert, Mathias J. Krause, Halim Kusumaatmaja

AI总结 本文提出了一种自由能晶格玻尔兹曼模型,能够模拟具有任意数量不混溶组分的流体系统。该方法严格满足降阶一致性,确保不存在的流体组分不会自发成核。通过引入一种新的表面张力力的离散化方法,实现全球动量守恒,且通过与移动无关的通量修正来保证降阶一致性。该方法通过多种静态和动态问题的测试,包括液镜、Janus滴状物、四元相分离和六组分层泊肃叶流,均与理论预测一致。最后,通过图案化液面和微流体乳滴生成展示了该方法的应用性。

Comments The following article has been accepted by The Journal of Chemical Physics. After it is published, it will be found at https://doi.org/10.1063/5.0327062

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AI中文摘要

We present a free energy lattice Boltzmann model capable of simulating fluid systems with an arbitrary number of immiscible components in principle. Our method is strictly reduction consistent, ensuring that absent fluid components do not spontaneously nucleate. We introduce a novel discretization of the surface tension force that globally conserves momentum to machine precision, and we enforce reduction consistency through a flux correction that is independent of the mobility. The method is benchmarked with a range of static and dynamic problems, including: liquid lenses, Janus droplets, quaternary phase separation, and six-component layered Poiseuille flow, and we obtain excellent agreement with theoretical predictions throughout. Finally, we demonstrate the applicability of the proposed method through patterned liquid surfaces and microfluidic emulsion droplet generation.

英文摘要

We present a free energy lattice Boltzmann model capable of simulating fluid systems with an arbitrary number of immiscible components in principle. Our method is strictly reduction consistent, ensuring that absent fluid components do not spontaneously nucleate. We introduce a novel discretization of the surface tension force that globally conserves momentum to machine precision, and we enforce reduction consistency through a flux correction that is independent of the mobility. The method is benchmarked with a range of static and dynamic problems, including: liquid lenses, Janus droplets, quaternary phase separation, and six-component layered Poiseuille flow, and we obtain excellent agreement with theoretical predictions throughout. Finally, we demonstrate the applicability of the proposed method through patterned liquid surfaces and microfluidic emulsion droplet generation.

2605.22210 2026-05-22 gr-qc

Constraints on Schwarzschild Black Hole in a Generalized Dehnen-Type $(1,4,γ)$ Dark Matter Halo via the S2 Star Orbit around Sgr A$^\star$

通过S2星围绕Sgr A$^\star$的轨道运动对Schwarzschild黑洞在广义Dehnen型(1,4,γ)暗物质晕中的约束

Tursunali Xamidov, Sanjar Shaymatov, Qiang Wu

AI总结 本文通过S2星的轨道运动研究了Schwarzschild黑洞嵌入广义Dehnen型(1,4,γ)暗物质晕中的运动方程,并利用观测数据对暗物质晕参数进行约束,得出了最佳拟合值和置信区间。

Comments 12 pages, 3 captioned figures, 1 captioned table

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AI中文摘要

银河系中心超大质量黑洞(BH)周围的暗物质(DM)晕的分布可能在银河系中心附近恒星动力学中留下可观察的印记。受此启发,我们研究了S2星在最近推导出的广义Schwarzschild BH解所嵌入的Dehnen型(1,4,γ)DM晕中的轨道运动,将其视为银河系中心Sgr A$^{\star}$的可能模型。与以往仅限于特定γ值的研究不同,本解描述了任意γ值的完全广义情况。我们推导了相应的运动方程并得到了一个轨道周期内的近日点进动。利用S2星的观测数据,我们通过马尔可夫链蒙特卡洛(MCMC)分析对Schwarzschild-Dehnen BH-DM系统参数进行约束。我们的结果给出了最佳拟合值γ=1.18±1.03(1.23±1.01),ρ_s=0.37±0.42(0.31±0.44),r_s=0.05±0.05(0.14±0.18),分别对应Do等人的观测数据和Gillessen等人的观测数据。我们进一步得到了95%置信度上限:γ<2.66(2.67),ρ_s<0.93(0.92),r_s<0.16(0.52)。这些结果表明,精确的恒星轨道测量可以为围绕超大质量BH的DM晕分布提供有意义的约束,并可能揭示Sgr A$^{\star}$的DM环境。

英文摘要

The distribution of dark matter (DM) halo around supermassive black holes (BHs) may leave observable imprints on stellar dynamics near galactic centers. Motivated by this, we investigate the orbital motion of the S2 star in the spacetime of a recently derived generalized Schwarzschild BH solution embedded in a Dehnen-type $(1,4,γ)$ DM halo, considering it as a possible model for Sgr A$^{\star}$ at the center of the Milky Way. Unlike previous studies restricted to specific values of the halo parameter $γ$, the present solution describes the fully generalized case with arbitrary $γ$. We derive the corresponding equations of motion and obtain the associated perihelion shift over one orbital period. Using observational data of the S2 star, we constrain the parameters of the Schwarzschild--Dehnen BH-DM system through a Markov Chain Monte Carlo (MCMC) analysis. Our results yield the best-fit values $γ= 1.18^{+1.03}_{-0.81}$ $(1.23^{+1.01}_{-0.85})$, $ρ_s = 0.37^{+0.42}_{-0.29}$ $(0.31^{+0.44}_{-0.26})$, and $r_s = 0.05^{+0.05}_{-0.03}$ $(0.14^{+0.18}_{-0.10})$ for observational data of Do et al.~\cite{Do19} and Gillessen et al.~\cite{Gillessen17ApJ}, respectively. We further obtain the corresponding 95\% confidence upper bounds: $γ< 2.66$ $(2.67)$, $ρ_s < 0.93$ $(0.92)$, and $r_s < 0.16$ $(0.52)$. These results demonstrate that precise stellar orbit measurements can provide meaningful constraints on the DM halo distributions surrounding supermassive BHs and may offer insights into the DM environment of Sgr A$^{\star}$ at the center of the Milky Way.

2605.22199 2026-05-22 hep-ph nucl-th

Equation of State at High Baryon Densities from a Thermodynamically Informed Neural Network

从热力学指导的神经网络推导高重子密度下的状态方程

Musfer Adzhymambetov

AI总结 本文提出了一种四维状态方程,用于描述有限温度和守恒电荷密度下的强相互作用物质,通过深度神经网络构建,能够复现有核子共振气体热力学,并在低重子化学势下与格点QCD一致,同时在高密度区域进行外推,适用于RHIC BES、FAIR、HADES和CBM等实验。

Comments 9 pages, 5 figures; feedback is greatly appreciated. The reader is encouraged to test the equation of state in their hydrodynamic codes. Feel free to reach out if you need help with implementation

详情
AI中文摘要

我们提出了一种四维状态方程,用于描述有限温度和守恒电荷密度下的强相互作用物质,该方程通过深度神经网络构建。它被设计用于直接应用于相对论重离子碰撞的混合模型:它在典型粒子化尺度上复现了核子共振气体热力学,与低重子化学势下的格点QCD一致,并能够外推到无法被这两种方法到达的高密度区域,这正是RHIC BES、FAIR、HADES和CBM等实验所针对的区域。通过在全相空间内强制热力学一致性,采用物理指导的损失函数。我们通过在整合的流体动力学模型中实现它,在零净奇异度和固定电荷-重子电荷比的情况下进行了演示。

英文摘要

We present a four-dimensional equation of state for strongly interacting matter at finite temperature and conserved charge densities, constructed using a deep neural network. It is designed for direct use in hybrid models of relativistic heavy-ion collisions: it reproduces hadron resonance gas thermodynamics at typical particlization scales, is consistent with lattice QCD at low baryon chemical potential, and extrapolates into the high-density region inaccessible to either approach, which is precisely the regime targeted by RHIC BES, FAIR, HADES, and CBM. Thermodynamic consistency throughout the full phase space is enforced via a physics-informed loss function. We demonstrate the developed equation of state by implementing it at zero net strangeness and fixed electric-to-baryon charge ratio within the integrated hydrokinetic model.