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Uniqueness of mild solutions to the Navier-Stokes equations in $big(C((0,T];L^d(mathbb{R}^d))cap L^infty((0,T);L^d(mathbb{R}^d))big)^d$ 纳维-斯托克斯方程在 $big(C((0,T];L^d(mathbb{R}^d))cap Linfty((0,T);L^d(mathbb{R}^d))big)^d$ 中的温和解的唯一性
Pub Date : 2024-02-02 DOI: arxiv-2402.01174
Zhirun Zhan
This paper deals with the uniqueness of mild solutions to the forced orunforced Navier-Stokes equations in the whole space. It is known that theuniqueness of mild solutions to the unforced Navier-Stokes equations holds in$big(L^{infty}((0,T);L^d(mathbb{R}^d))big)^d$ when $dgeq 4$, and in$big(C([0,T];L^d(mathbb{R}^d))big)^d$ when $dgeq3$. As for the forcedNavier-Stokes equations, when $dgeq3$ the uniqueness of mild solutions in$big(C([0,T];L^{d}(mathbb{R}^d))big)^d$ with force $f$ in some Lorentz spaceis known. In this paper we show that for $dgeq3$, the uniqueness of mildsolutions to the forced Navier-Stokes equations in$big(C((0,T];L^d(mathbb{R}^d))cap L^infty((0,T);L^d(mathbb{R}^d))big)^d$holds when there is a mild solution in $big(C([0,T];L^d(mathbb{R}^d))big)^d$with the same initial data and force. As a corollary of this result, weestablish the uniqueness of mild solutions to the unforced Navier-Stokesequations in $big(C((0,T];L^3(mathbb{R}^3))capL^infty((0,T);L^3(mathbb{R}^3))big)^3$.
本文论述了强制或非强制纳维-斯托克斯方程的温和解在整个空间中的唯一性。众所周知,当 $dgeq 4$ 时,非强迫纳维-斯托克斯方程的温和解的唯一性在$big(L^{infty}((0,T);L^d(mathbb{R}^d))big)^d$ 中成立;当 $dgeq3$ 时,温和解的唯一性在$big(C([0,T];L^d(mathbb{R}^d))big)^d$ 中成立。至于受迫纳维尔-斯托克斯方程,当 $dgeq3$ 时,$big(C([0,T];L^{d}(mathbb{R}^d))big^d$ 中的温和解的唯一性与某个洛伦兹空间中的力 $f$ 是已知的。在本文中,我们证明了对于 $dgeq3$,在$big(C((0,T];L^d(mathbb{R}^d))cap L^infty((0,T);当$big(C([0,T];L^d(mathbb{R}^d))big)^d$中存在温和解且初始数据和作用力相同时,L^d(mathbb{R}^d))big)^d$成立。作为这一结果的推论,我们在 $big(C((0,T];L^3(mathbb{R}^3))capL^infty((0,T);L^3(mathbb{R}^3))big^3$ 中建立了非受迫 Navier-Stokesequations 的温和解的唯一性。
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引用次数: 0
Critical Casimir effect in a disordered $O(2)$-symmetric model 无序$O(2)$对称模型中的临界卡西米尔效应
Pub Date : 2024-02-02 DOI: arxiv-2402.01588
G. O. Heymans, N. F. Svaiter, B. F. Svaiter, G. Krein
Critical Casimir effect appears when critical fluctuations of an orderparameter interact with classical boundaries. We investigate this effect in thesetting of a Landau-Ginzburg model with continuous symmetry in the presence ofquenched disorder. The quenched free energy is written as an asymptotic seriesof moments of the models partition function. Our main result is that, in thepresence of a strong disorder, Goldstone modes of the system contribute eitherwith an attractive or with a repulsive force. This result was obtained usingthe distributional zeta-function method without relying on any particularansatz in the functional space of the moments of the partition function.
当阶参数的临界波动与经典边界相互作用时,就会出现临界卡西米尔效应。我们研究了在存在淬火无序的情况下,具有连续对称性的朗道-金兹堡模型中的这种效应。淬火自由能被写成模型分割函数的渐近矩序列。我们的主要结果是,在存在强无序的情况下,系统的金石模式要么产生吸引力,要么产生排斥力。这一结果是利用分布zeta函数方法得到的,而不依赖于分区函数矩的函数空间中的任何特定剖分。
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引用次数: 0
Twisted TMDs in the small-angle limit: exponentially flat and trivial bands 小角度极限下的扭曲 TMD:指数平坦带和琐碎带
Pub Date : 2024-01-11 DOI: arxiv-2401.06078
Simon Becker, Mengxuan Yang
Recent experiments discovered fractional Chern insulator states at zeromagnetic field in twisted bilayer MoTe$_2$ [C23,Z23] and WSe$_2$ [MD23]. Inthis article, we study the MacDonald Hamiltonian for twisted transition metaldichalcogenides (TMDs) and analyze the low-lying spectrum in TMDs in the limitof small twisting angles. Unlike in twisted bilayer graphene Hamiltonians, weshow that TMDs do not exhibit flat bands. The flatness in TMDs for smalltwisting angles is due to spatial confinement by a matrix-valued potential. Weshow that by generalizing semiclassical techniques developed by Simon [Si83]and Helffer-Sj"ostrand [HS84] to matrix-valued potentials, there exists a widerange of model parameters such that the low-lying bands are of exponentiallysmall width in the twisting angle, topologically trivial, and obey a harmonicoscillator-type spacing with explicit parameters.
最近的实验发现了扭曲双层 MoTe$_2$ [C23,Z23] 和 WSe$_2$ [MD23]在零磁场下的分数切尔诺绝缘体态。在这篇文章中,我们研究了扭曲过渡金属二卤化物(TMDs)的麦克唐纳哈密顿,并分析了 TMDs 在小扭曲角极限下的低电平谱。与扭曲的双层石墨烯哈密顿不同,我们发现 TMDs 并不表现出平坦带。在 TMD 中,小扭转角的平坦性是由于矩阵值电势的空间限制造成的。我们发现,通过将 Simon [Si83] 和 Helffer-Sj"ostrand [HS84]开发的半经典技术推广到矩阵值电势,存在着更宽的模型参数范围,从而使低洼带在扭转角上的宽度呈指数级小,拓扑上是微不足道的,并服从具有明确参数的谐振子型间距。
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引用次数: 0
Dispersionless limit of the B-Toda hierarchy B-Toda 层次结构的无分散极限
Pub Date : 2024-01-11 DOI: arxiv-2401.05919
A. Zabrodin
We study the dispersionless limit of the recently introduced Toda latticehierarchy with constraint of type B (the B-Toda hierarchy) and compare it withthat of the DKP and C-Toda hierarchies. The dispersionless limits of the B-Todaand C-Toda hierarchies turn out to be the same.
我们研究了最近引入的带有 B 型约束的户田网格体系(B-户田体系)的无离散极限,并将其与 DKP 和 C-户田体系进行了比较。结果表明,B-Toda 和 C-Toda 层次结构的无色散极限是相同的。
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引用次数: 0
Integrability and non-invertible symmetries of projector spin chains 投影自旋链的积分性和不可逆转对称性
Pub Date : 2024-01-11 DOI: arxiv-2401.05662
Pramod Padmanabhan, Kun Hao, Vladimir Korepin
We show that nearest-neighbor spin chains composed of projectors to 2-quditproduct states are integrable. The $R$-matrices (with a multidimensionalspectral parameter) include additive as well as non-additive parameters. Theysatisfy the colored Yang-Baxter equation. The local terms of the resultingHamiltonians exhaust projectors with all possible ranks for a 2-qudit space.The Hamiltonian can be Hermitian or not, with or without frustration. Theground state structures of the frustration-free qubit spin chains are analysed.These systems have either global or local non-invertible symmetries. Inparticular, the rank 1 case has two product ground states that break globalnon-invertible symmetries (analogous to the case of the two ferromagneticstates breaking the global $mathbb{Z}_2$ symmetry of the $XXX$ spin chain).The Bravyi-Gosset conditions for spectral gaps show that these systems aregapped. The associated Yang-Baxter algebra and the spectrum of the transfermatrix are also studied.
我们证明,由投影到 2-位积态组成的近邻自旋链是可积分的。R$矩阵(具有多维谱参数)包括可加参数和不可加参数。它们满足彩色杨-巴克斯特方程。由此得到的哈密尔顿的局部项会穷举出具有 2-qudit 空间所有可能等级的投影。我们分析了无沮度四比特自旋链的基态结构。特别是秩 1 的情况下,有两个乘积基态打破了全局非不可逆对称性(类似于两个铁磁态打破了 $XXX$ 自旋链的全局 $mathbb{Z}_2$ 对称性的情况)。我们还研究了相关的杨-巴克斯特代数和转移矩阵谱。
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引用次数: 0
Analytical approximations for generalized quantum Rabi models 广义量子拉比模型的分析近似值
Pub Date : 2024-01-11 DOI: arxiv-2401.05615
Chon-Fai Kam, Yang Chen
The quantum Rabi model is essential for understanding interacting quantumsystems. It serves as the simplest non-integrable yet solvable model describingthe interaction between a two-level system and a single mode of a bosonicfield. In this study, we delve into the exploration of the generalized quantumRabi model, wherein the bosonic mode of the field undergoes squeezing.Utilizing the Segal-Bargmann representation of the infinite-dimensional Hilbertspace, we demonstrate that the energy spectrum of the generalized quantum Rabimodel, when both the Rabi coupling strength and the squeezing strength are notsignificantly large compared to the field mode frequency, can be analyticallydetermined by a bi-confluent Fuchsian equation with two regular singularitiesat 0 and 1 and an irregular singularity of rank two at infinity.
量子拉比模型对于理解相互作用的量子系统至关重要。它是描述两级系统与玻色场单模之间相互作用的最简单的不可解模型。在本研究中,我们将深入探讨广义量子拉比模型,其中玻色场模式会发生挤压。利用无穷维希尔伯特空间的西格尔-巴格曼表示法,我们证明了当拉比耦合强度和挤压强度与场模式频率相比都不是很大时,广义量子拉比模型的能谱可以由一个在 0 和 1 处有两个规则奇点、在无穷远处有一个秩为 2 的不规则奇点的双汇合福齐安方程来分析确定。
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引用次数: 0
Lagrangian Relations and Quantum $L_infty$ Algebras 拉格朗日关系与量子 $L_infty$ 算法
Pub Date : 2024-01-11 DOI: arxiv-2401.06110
Branislav Jurčo, Ján Pulmann, Martin Zika
Quantum $L_infty$ algebras are higher loop generalizations of cyclic$L_infty$ algebras. Motivated by the problem of defining morphisms betweensuch algebras, we construct a linear category of $(-1)$-shifted symplecticvector spaces and distributional half-densities, originally proposed byv{S}evera. Morphisms in this category can be given both by formalhalf-densities and Lagrangian relations; we prove that the composition of suchmorphisms recovers the construction of homotopy transfer of quantum $L_infty$algebras. Finally, using this category, we propose a new notion of a relationbetween quantum $L_infty$ algebras.
量子$L_infty$代数是循环$L_infty$代数的高环广义。受定义这些代数之间的态的问题的启发,我们构建了一个$(-1)$移位交映向量空间和分布半密度的线性范畴,这个范畴最初是由v{S}evera提出的。这个范畴中的变形既可以由形式半密度给出,也可以由拉格朗日关系给出;我们证明了这种变形的组合恢复了量子 $L_infty$ 对象的同调转移的构造。最后,利用这个范畴,我们提出了量子 $L_infty$ 对象之间关系的新概念。
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引用次数: 0
Classical and Quantum solutions in Scalar field cosmology via the Eisenhart lift and linearization 通过艾森哈特提升和线性化实现标量场宇宙学中的经典和量子解
Pub Date : 2024-01-11 DOI: arxiv-2401.05775
Andronikos Paliathanasis
This study introduces a novel approach for solving the cosmological fieldequations within scalar field theory by employing the Eisenhart lift. The fieldequations are reformulated as a system of geodesic equations for the Eisenhartmetric. In the case of an exponential potential, the Eisenhart metric is shownto be conformally flat. By applying basic geometric principles, a new set ofdynamical variables is identified, allowing for the linearization of the fieldequations and the derivation of classical cosmological solutions. However, thequantization of the Eisenhart system reveals a distinct set of solutions forthe wavefunction, particularly in the presence of symmetry breaking at thequantum level.
本研究介绍了一种在标量场理论中利用艾森哈特提升求解宇宙学场方程的新方法。场方程被重新表述为艾森哈特度量的大地方程组。在指数势的情况下,艾森哈特度量被证明是保角平坦的。通过应用基本几何原理,确定了一组新的动力学变量,从而实现了场方程的线性化和经典宇宙学解的推导。然而,艾森哈特系统的量子化揭示了一组不同的波函数解,特别是在量子水平对称性破缺的情况下。
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引用次数: 0
Invariance principle for the KPZ equation arising in stochastic flows of kernels 核随机流中出现的 KPZ 方程的不变性原理
Pub Date : 2024-01-11 DOI: arxiv-2401.06073
Shalin Parekh
We consider a generalized model of random walk in dynamical randomenvironment, and we show that the multiplicative-noise stochastic heat equation(SHE) describes the fluctuations of the quenched density at a certain preciselocation in the tail. The distribution of transition kernels is fixed ratherthan changing under the diffusive rescaling of space-time, i.e., there is nocritical tuning of the model parameters when scaling to the stochastic PDElimit. The proof is done by pushing the methods developed in [arxiv 2304.14279,arXiv 2311.09151] to their maximum, substantially weakening the assumptions andobtaining fairly sharp conditions under which one expects to see the SHE arisein a wide variety of random walk models in random media. In particular we areable to get rid of conditions such as nearest-neighbor interaction as well asspatial independence of quenched transition kernels. Moreover, we observe anentire hierarchy of moderate deviation exponents at which the SHE can be found,confirming a physics prediction of J. Hass.
我们考虑了动态游走环境中的广义随机游走模型,并证明乘法噪声随机热方程(SHE)描述了尾部某一精确定位处的淬火密度波动。过渡核的分布是固定的,而不是在时空的扩散性重缩放下发生变化的,也就是说,当缩放到随机PDE极限时,模型参数不存在临界调整。证明是通过将[arxiv 2304.14279,arXiv 2311.09151]中开发的方法推向极致来完成的,大大弱化了假设,并获得了相当尖锐的条件,在这些条件下,我们有望看到SHE出现在随机介质中的各种随机行走模型中。特别是,我们可以摆脱近邻相互作用等条件,以及淬火转换核的空间独立性。此外,我们还观察到了中等偏差指数的整个层次结构,在这个层次上可以发现 SHE,这证实了 J. Hass 的物理学预测。
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引用次数: 0
Enhanced Stability in Quantum Optimal Transport Pseudometrics: From Hartree to Vlasov-Poisson 量子优化传输伪计量学中的增强稳定性:从哈特里到弗拉索夫-泊松
Pub Date : 2024-01-11 DOI: arxiv-2401.05773
Mikaela Iacobelli, Laurent Lafleche
In this paper we establish almost-optimal stability estimates in quantumoptimal transport pseudometrics for the semiclassical limit of the Hartreedynamics to the Vlasov-Poisson equation, in the regime where the solutions havebounded densities. We combine Golse and Paul's method from [Arch. Ration. Mech.Anal. 223:57-94, 2017], which uses a semiclassical version of the optimaltransport distance and which was adapted to the case of the Coulomb andgravitational interactions by the second author in [J. Stat. Phys. 177:20-60,2019], with a new approach developed by the first author in [Arch. Ration.Mech. Anal. 244:27-50, 2022] to quantitatively improve stability estimates inkinetic theory.
在本文中,我们为哈特里德动力学对弗拉索夫-泊松方程的半经典极限建立了量子最优传输伪计量学中的几乎最优的稳定性估计,在该机制中,解具有有界密度。我们将第二作者在[J. Stat. Phys. 177:20-60,2019]中改编为库仑和引力相互作用情况的[Arch. Ration. Mech. Anal. 223:57-94,2017]中使用最优传输距离半经典版本的 Golse 和 Paul 方法,与第一作者在[Arch. Ration. Mech. Anal. 244:27-50,2022]中开发的新方法相结合,定量改进动力学理论中的稳定性估计。
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引用次数: 0
期刊
arXiv - PHYS - Mathematical Physics
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