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Bounds on the growth of energy for particles on the torus with unbounded time dependent perturbations 环面上粒子能量增长的约束与无限制的时间相关扰动
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-07 DOI: 10.1063/5.0196229
Dario Bambusi
We prove a C∞ version of Nekhoroshev theorem for time dependent Hamiltonians in Rd×Td. Precisely, we prove a result showing that for all times the energy of the system is bounded by a constant times ⟨t⟩ɛ. We apply the result to the dynamics of a charged particle in Td subject to a time dependent electromagnetic field.
我们证明了Rd×Td中时间相关哈密尔顿定理的C∞版本。确切地说,我们证明了一个结果,即在所有时间内,系统的能量都以常数⟨t⟩ɛ为界。我们将这一结果应用于 Td 中一个带电粒子在随时间变化的电磁场作用下的动力学。
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引用次数: 0
Classical solvability to the free boundary problem for a foam drainage equation. II. From the interface to the bottom 泡沫排水方程自由边界问题的经典可解性。II.从界面到底部
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-06 DOI: 10.1063/5.0155457
Atusi Tani, Marie Tani
We study a nonlinear partial differential equation describing the evolution of a foam drainage in one dimensional case which was proposed by Goldfarb et al. in 1988 in order to investigate the flow of liquid through channels (Plateau borders) and nodes (intersections of four channels) between the bubbles, driven by gravity and capillarity. Its mathematical studies so far are mainly restricted within numerical and particular solutions; as for mathematical analysis of it there are only a few. We prove that the free boundary problem for the foam drainage equation in the region below an interface to the bottom in a foam column admits a unique global-in-time classical solution by the standard classical mathematical method, the maximum principle. Moreover, the existence of its steady solution and its stability are shown.
我们研究的是描述一维情况下泡沫排水演变的非线性偏微分方程,该方程由 Goldfarb 等人于 1988 年提出,用于研究液体在重力和毛细管作用下流经气泡之间的通道(高原边界)和节点(四个通道的交叉点)的情况。迄今为止,对它的数学研究主要局限于数值解和特定解;至于数学分析,则寥寥无几。我们通过标准的经典数学方法--最大值原理,证明了泡沫排水方程在泡沫柱底部界面以下区域的自由边界问题具有唯一的全局时间经典解。此外,我们还证明了其稳定解的存在性和稳定性。
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引用次数: 0
Classical solvability to the free boundary problem for a foam drainage equation. I. From the top to the interface 泡沫排水方程自由边界问题的经典可解性。I. 从顶部到界面
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-06 DOI: 10.1063/5.0155449
Atusi Tani, Marie Tani
We study a nonlinear partial differential equation describing the evolution of a foam drainage in one dimensional case which was proposed by Goldfarb et al. [Izv. Akad. Nauk SSSR Mekh. Ghidk. Gaza 2, 103–108 (1988)] in order to investigate the flow of liquid through channels (Plateau borders) and nodes (intersections of four channels) between the bubbles, driven by gravity and capillarity. Its mathematical studies so far are mainly restricted within numerical and particular solutions; as for mathematical analysis of it there are only a few. We prove that the free boundary problem for the foam drainage equation in the region from the top to the interface in a foam column admits a unique global-in-time classical solution by the standard classical mathematical method, the maximum principle and the comparison theorem. Moreover, the existence of its steady solution and its stability are discussed.
我们研究 Goldfarb 等人[Izv. Akad. Nauk SSSR Mekh. Ghidk. Gaza 2, 103-108 (1988)]提出的描述一维情况下泡沫排水演变的非线性偏微分方程,以研究液体在重力和毛细管作用下通过气泡之间的通道(高原边界)和节点(四个通道的交叉点)的流动。迄今为止,对它的数学研究主要局限于数值解和特定解;至于数学分析,则寥寥无几。我们通过标准经典数学方法、最大值原理和比较定理证明,泡沫排水方程在泡沫柱顶部到界面区域的自由边界问题有唯一的全局时间经典解。此外,还讨论了其稳定解的存在性及其稳定性。
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引用次数: 0
Next-order correction to the Dirac exchange energy of the free electron gas in the thermodynamic limit and generalized gradient approximations 热力学极限和广义梯度近似中自由电子气体的狄拉克交换能的下阶修正
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-06 DOI: 10.1063/5.0152359
Thiago Carvalho Corso, Gero Friesecke
We derive the next order correction to the Dirac exchange energy for the free electron gas in a box with zero boundary conditions in the thermodynamic limit. The correction is of the order of the surface area of the box, and comes from three different contributions: (i) a real-space boundary layer, (ii) a boundary-condition-induced small shift of Fermi momentum and bulk density, and (iii) a long-range electrostatic finite-size correction. Moreover we show that the local density approximation, in addition to capturing the bulk term exactly, also produces a correction of the correct order but not the correct size. Generalized gradient approximation (GGA) corrections are found to be capable of capturing the surface term exactly, provided the gradient enhancement factor satisfies a simple explicit integral constraint. For current GGAs such as B88 and Perdew, Burke and Ernzerhof we find that the new constraint is not satisfied and the size of the surface correction is overestimated by about ten percent. The new constraint might thus be of interest for the design of future exchange functionals.
我们推导出在热力学极限下,自由电子气体在零边界条件盒中的狄拉克交换能的次阶修正。修正量与盒子的表面积相当,来自三个不同的贡献:(i) 实际空间边界层,(ii) 边界条件引起的费米动量和体积密度的微小移动,以及 (iii) 长程静电有限尺寸修正。此外,我们还证明了局部密度近似除了能准确捕捉体量项之外,还能产生正确阶次的修正,但修正的大小并不正确。只要梯度增强因子满足一个简单的显式积分约束,广义梯度近似(GGA)修正就能准确捕捉表面项。对于目前的 GGA,如 B88 和 Perdew,Burke 和 Ernzerhof,我们发现新的约束条件无法满足,表面修正的大小被高估了约百分之十。因此,新约束条件可能对未来交换函数的设计有意义。
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引用次数: 0
Uniqueness of blowup at singular points for superconductivity problem 超导问题奇点炸裂的唯一性
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-05 DOI: 10.1063/5.0213622
Lili Du, Xu Tang, Cong Wang
In this paper, we investigate the uniqueness of blowup at singular points of the free boundary in the superconductivity problem. We provide a sufficient condition and demonstrate that this condition can be verified in certain special cases. The proof of the main results in this paper is primarily based on Weiss-type and Monneau-type monotonicity formulas, and is inspired by the recent paper [Chen et al. arXiv: 2204.11426v2 (2022)].
本文研究了超导问题中自由边界奇异点炸裂的唯一性。我们提供了一个充分条件,并证明这个条件在某些特殊情况下可以得到验证。本文主要结果的证明主要基于 Weiss 型和 Monneau 型单调性公式,并受到近期论文 [Chen et al. arXiv: 2204.11426v2 (2022)] 的启发。
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引用次数: 0
Solutions to a generalized Chern–Simons Higgs model on finite graphs by topological degree 有限图上广义切尔恩-西蒙斯希格斯模型的拓扑度解决方案
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-05 DOI: 10.1063/5.0210421
Songbo Hou, Wenjie Qiao
Consider a finite connected graph denoted as G = (V, E). This study explores a generalized Chern-Simons Higgs model, characterized by the equation Δu=λeu(eu−1)2p+1+f, where Δ denotes the graph Laplacian, λ is a real number, p is a non-negative integer, and f is a function on V. Through the computation of the topological degree, this paper demonstrates the existence of a single solution for the model. Further analysis of the interplay between the topological degree and the critical group of an associated functional reveals the presence of multiple solutions. These findings extend the work of Li et al. [Calc. Var. 63, 81 (2024)] and Chao and Hou [J. Math. Anal. Appl. 519, 126787 (2023)].
考虑一个有限连通图,表示为 G = (V,E)。本研究探讨了一个广义的切尔恩-西蒙斯希格斯模型,该模型的方程Δu=λeu(eu-1)2p+1+f,其中Δ表示图的拉普拉奇,λ是实数,p是非负整数,f是 V 上的函数。通过计算拓扑度,本文证明了该模型存在单解。通过进一步分析拓扑度和相关函数临界群之间的相互作用,发现了多解的存在。这些发现扩展了 Li 等人 [Calc. Var. 63, 81 (2024)] 以及 Chao 和 Hou [J. Math. Anal. Appl. 519, 126787 (2023)] 的工作。
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引用次数: 0
Rigidity on quantum symmetry for a certain class of graph C*-algebras 某类图 C* 结构的量子对称刚性
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-05 DOI: 10.1063/5.0177215
Ujjal Karmakar, Arnab Mandal
Quantum symmetry of graph C*-algebras has been studied, under the consideration of different formulations, in the past few years. It is already known that the compact quantum group (C(S1)∗C(S1)∗⋯∗C(S1)︸|E(Γ)|−times,Δ) [in short, *|E(Γ)|C(S1),Δ] always acts on a graph C*-algebra for a finite, connected, directed graph Γ in the category introduced by Joardar and Mandal, where |E(Γ)| ≔ number of edges in Γ. In this article, we show that for a certain class of graphs including Toeplitz algebra, quantum odd sphere, matrix algebra etc. the quantum symmetry of their associated graph C*-algebras remains *|E(Γ)|C(S1),Δ in the category as mentioned before. More precisely, if a finite, connected, directed graph Γ satisfies the following graph theoretic properties: (i) there does not exist any cycle of length ≥2 (ii) there exists a path of length (|V(Γ)| − 1) which consists all the vertices, where |V(Γ)| ≔ number of vertices in Γ (iii) given any two vertices (may not be distinct) there exists at most one edge joining them, then the universal object coincides with *|E(Γ)|C(S1),Δ. Furthermore, we have pointed out a few counter examples whenever the above assumptions are violated.
在过去的几年里,人们根据不同的表述对图 C* 矩阵的量子对称性进行了研究。我们已经知道,紧凑量子群 (C(S1)∗C(S1)∗⋯∗C(S1)︸|E(Γ)|-times,Δ) [简言之,*|E(Γ)|C(S1)、Δ]总是作用于 Joardar 和 Mandal 所引入类别中有限、连通、有向图 Γ 的图 C* 代数,其中 |E(Γ)| Γ 中边的数目。在本文中,我们证明了对于某一类图,包括托普利兹代数、量子奇异球、矩阵代数等,其相关图 C*-代数的量子对称性仍然是*|E(Γ)|C(S1),Δ,如前所述。更确切地说,如果一个有限的、连通的、有向图 Γ 满足以下图论性质:(i) 不存在任何长度≥2 的循环 (ii) 存在一条长度为 (|V(Γ)| - 1) 的路径,该路径包含所有顶点,其中 |V(Γ)| Γ 中顶点的数目 (iii) 给定任意两个顶点(可能不是不同的),最多存在一条边连接它们,那么普遍对象与 *|E(Γ)|C(S1),Δ 重合。此外,我们还指出了一些违反上述假设的反例。
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引用次数: 0
Global asymptotic stability in a two-dimensional chemotaxis model arising from tumor invasion 肿瘤侵袭引起的二维趋化模型的全局渐近稳定性
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-05 DOI: 10.1063/5.0145255
Chun Wu
This paper considers the chemotaxis model with density-suppressed motility: ut = ∇·(φ(v)∇u) + ∇·(ψ(v)u∇v) + f(u), vt = Δv + wz, wt = −wz, wt = −wz, zt = Δz − z + u, x ∈ Ω, t > 0 under homogeneous Neumann boundary conditions in a smooth bounded domain Ω⊂R2. Given that the positive motility function φ(v) has the lower-upper bound, we can conclude that the system possesses a unique bounded classical solution. Moreover, it is proved that the global bounded solution (u, v, w, z) will converge to r/μ1α−1,v̄0+w̄0,0,r/μ1α−1 as t → ∞.
本文考虑的是密度抑制运动的趋化模型:ut =∇-(φ(v)∇u) +∇-(ψ(v)u∇v) + f(u),vt = Δv + wz,wt = -wz,wt = -wz,zt = Δz - z + u,x∈Ω,t >0,在光滑有界域Ω⊂R2的均相诺伊曼边界条件下。鉴于正运动函数φ(v) 具有上下限,我们可以得出结论,该系统具有唯一的有界经典解。此外,还证明了当 t → ∞ 时,全局有界解 (u, v, w, z) 将收敛于 r/μ1α-1,v̄0+w̄0,0,r/μ1α-1。
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引用次数: 0
Improved regularity criteria for the MHD equations 改进的多流体力学方程正则准则
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-01 DOI: 10.1063/5.0179393
Weihua Wang, Shixia Xu
In this paper, we establish new regularity criteria for the three-dimensional (3D) viscous incompressible magnetohydrodynamic (MHD) equations. It is proved that if the solution of the MHD equations satisfies u3∈Lp(0,T;Lq(R3)),j3∈Lr(0,T;Ls(R3)),2p+3q=1324,7213≤q≤∞;2r+3s=2,32<s≤∞ or u3∈Lp(0,T;Lq(R3)),w3∈Lr(0,T;Ls(R3)),2p+3q=1324,7213≤q≤∞;2r+3s=2,32<s≤∞, then the regularity of the solution on (0, T), where u3, j3 and ω3 are the third component of velocity u, current density ∇ × b and vorticity ∇ × u, respectively. These results give new improvements of regularity theory of weak solutions.
本文为三维(3D)粘性不可压缩磁流体动力学(MHD)方程建立了新的正则性准则。研究证明,如果 MHD 方程的解满足 u3∈Lp(0,T;Lq(R3)),j3∈Lr(0,T;Ls(R3)),2p+3q=1324,7213≤q≤∞;2r+3s=2,32<s≤∞ or u3∈Lp(0,T;Lq(R3)),w3∈Lr(0,T;Ls(R3)),2p+3q=1324,7213≤q≤∞;2r+3s=2,32<s≤∞,那么解在(0,T)上的正则性,其中 u3、j3 和 ω3 分别是速度 u、电流密度 ∇ × b 和涡度 ∇ × u 的第三分量。这些结果对弱解的正则性理论有了新的改进。
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引用次数: 0
New lower bounds on the radius of spatial analyticity for the higher order nonlinear dispersive equation on the real line 实线上高阶非线性色散方程空间解析性半径的新下限
IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-08-01 DOI: 10.1063/5.0211479
Zaiyun Zhang, Youjun Deng, Xinping Li
In this paper, benefited some ideas of Wang [J. Geom. Anal. 33, 18 (2023)] and Dufera et al. [J. Math. Anal. Appl. 509, 126001 (2022)], we investigate persistence of spatial analyticity for solution of the higher order nonlinear dispersive equation with the initial data in modified Gevrey space. More precisely, using the contraction mapping principle, the bilinear estimate as well as approximate conservation law, we establish the persistence of the radius of spatial analyticity till some time δ. Then, given initial data that is analytic with fixed radius σ0, we obtain asymptotic lower bound σ(t)≥c|t|−12, for large time t ≥ δ. This result improves earlier ones in the literatures, such as Zhang et al. [Discrete Contin. Dyn. Syst. B 29, 937–970 (2024)], Huang–Wang [J. Differ. Equations 266, 5278–5317 (2019)], Liu–Wang [Nonlinear Differ. Equations Appl. 29, 57 (2022)], Wang [J. Geom. Anal. 33, 18 (2023)] and Selberg–Tesfahun [Ann. Henri Poincaré 18, 3553–3564 (2017)].
本文借鉴王文[J. Geom. Anal. 33, 18 (2023)]和杜费拉等人[J. Math. Anal. Appl. 509, 126001 (2022)]的一些观点,研究了高阶非线性色散方程在修正 Gevrey 空间中初始数据的空间解析性的持久性。更确切地说,利用收缩映射原理、双线性估计以及近似守恒定律,我们确定了空间解析性半径在某个时间 δ 之前的持久性。然后,给定初始数据为具有固定半径 σ0 的解析性数据,我们得到了大时间 t ≥ δ 时的渐近下界 σ(t)≥c|t|-12。这一结果改进了早期文献中的结果,如 Zhang 等人 [Discrete Contin.方程 266, 5278-5317 (2019)], Liu-Wang [Nonlinear Differ. Equations Appl. 29, 57 (2022)], Wang [J. Geom. Anal. 33, 18 (2023)] and Selberg-Tesfahun [Ann. Henri Poincaré 18, 3553-3564 (2017)].
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引用次数: 0
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Journal of Mathematical Physics
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