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Admissible inertial manifolds for neutral equations and applications 中性方程的可容许惯性流形及其应用
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-09-12 DOI: 10.1080/14689367.2021.1971623
T. N. H. Vu, Thieu Huy Nguyen, Anh Minh Le
We study the existence of admissible inertial manifolds for parabolic neutral functional differential equations of the form where the linear differential operator A is positive definite and self-adjoint with a discrete spectrum, the difference operator F is a bounded linear operator, and the delay nonlinear operator f is φ-Lipschitz for φ belonging to an admissible function space defined on . Our method is based on Lyapunov–Perron's equations, duality estimates in admissible spaces and F-induced trajectories. An application to heat transfer with delays in materials with memory is also given to illustrate our results.
我们研究了抛物型中立型泛函微分方程的容许惯性流形的存在性,其中线性微分算子A是正定的且与离散谱自伴的,差分算子F是有界线性算子,延迟非线性算子F是φ-Lipschitz,φ属于上定义的容许函数空间。我们的方法基于李雅普诺夫-佩龙方程、容许空间中的对偶估计和F诱导轨迹。文中还给出了一个应用于含记忆材料中的延迟传热的例子来说明我们的结果。
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引用次数: 2
Behaviour of trajectories near a two-cycle heteroclinic network 双环异斜网络附近轨迹的行为
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-07-21 DOI: 10.1080/14689367.2023.2225463
O. Podvigina
Heteroclinic networks and cycles are invariant sets comprised of interacting nodes connected by heteroclinic trajectories. Often the sets are not asymptotically stable but attract a positive measure set from its small neighbourhood. This property is called fragmentary asymptotic stability (f.a.s.). The definition implies that if a stable cycle is a subset of a heteroclinic network, then the entire network is stable. In general, the converse is wrong. In the examples given in the literature, the presence of spiralling due to complex eigenvalues in the linearization around an equilibrium implies switching between subcycles of the f.a.s. network, thus preventing individual cycles from being stable. We study the behaviour of trajectories near a heteroclinic network comprised of two cycles where the eigenvalues of the linearizations are real. The trajectories can be attracted to one of the cycles, or they can switch regularly or irregularly between them. To describe regular switching, we introduce the notions of an omnicycle and its trail-stability, and prove conditions for trail-stability of an omnicycle in the considered network.
异宿网络和环是由异宿轨迹连接的相互作用节点组成的不变集。集合通常不是渐近稳定的,而是从其小邻域吸引正测度集。这个性质被称为片断渐近稳定性(f.a.s.)。这个定义意味着,如果一个稳定环是一个异宿网络的子集,那么整个网络是稳定的。总的来说,相反的说法是错误的。在文献中给出的例子中,在平衡附近的线性化中,由于复杂的特征值而出现螺旋,这意味着在f.a.s.网络的子循环之间进行切换,从而防止单个循环稳定。我们研究了由两个循环组成的异宿网络附近轨迹的行为,其中线性化的特征值是实的。轨迹可以被吸引到其中一个周期,也可以在它们之间有规律或不规则地切换。为了描述规则切换,我们引入了全循环及其踪迹稳定性的概念,并证明了所考虑的网络中全循环踪迹稳定性的条件。
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引用次数: 2
The Brin–Katok formula for dynamical systems admitting mistakes 动态系统的Brin-Katok公式承认错误
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-07-16 DOI: 10.1080/14689367.2021.1949436
Chiyi Luo, Yun Zhao
Given a topological dynamical system (X,T), i.e., T is a continuous transformation on a compact metric space X), that admits mistakes and an invariant measure, this paper proves the Brin–Katok formula in this case. In particular, this paper finds that it suffices to study a mistake function which is linear in n and monotonic with respect to Δ. Consequently, this paper shows the Brin–Katok formula for the mean Bowen ball replacing the Bowen metrics with the mean Bowen metrics. The results presented in this paper may have some applications in the study of other properties of a dynamical system which admits small errors.
给定一个拓扑动力系统(X,T),即T是紧度量空间X上的一个允许错误的连续变换,且是一个不变测度,证明了这种情况下的Brin-Katok公式。特别地,本文发现研究一个在n上是线性的,关于Δ单调的错误函数就足够了。因此,本文给出了用平均Bowen指标代替Bowen指标的平均Bowen球的Brin-Katok公式。本文的结果可用于研究允许小误差的动力系统的其他性质。
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引用次数: 0
A dynamical proof of the van der Corput inequality 范德科普特不等式的一个动态证明
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-22 DOI: 10.1080/14689367.2022.2100244
Nikolai Edeko, Henrik Kreidler, R. Nagel
We provide a dynamical proof of the van der Corput inequality for sequences in Hilbert spaces that is based on the Furstenberg correspondence principle. This is done by reducing the inequality to the mean ergodic theorem for contractions on Hilbert spaces. The key difficulty therein is that the Furstenberg correspondence principle is, a priori, limited to scalar-valued sequences. We, therefore, discuss how interpreting the Furstenberg correspondence principle via the Gelfand–Naimark–Segal construction for -algebras allows to study not just scalar but general Hilbert space-valued sequences in terms of unitary operators. This yields a proof of the van der Corput inequality in the spirit of the Furstenberg correspondence principle and the flexibility of this method is discussed via new proofs for different variants of the inequality.
基于Furstenberg对应原理,我们给出了Hilbert空间中序列的van der Corput不等式的一个动力学证明。这是通过将不等式简化为希尔伯特空间上收缩的平均遍历定理来实现的。其中的关键困难在于,Furstenberg对应原理先验地局限于标量值序列。因此,我们讨论了如何通过代数的Gelfand–Naimark–Segal构造来解释Furstenberg对应原理,从而不仅可以用酉算子研究标量序列,还可以用酉算子研究一般希尔伯特空间值序列。这根据Furstenberg对应原理的精神给出了van der Corput不等式的一个证明,并通过对不等式的不同变体的新证明讨论了该方法的灵活性。
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引用次数: 2
Global stability analysis of a delay cell-population model of hepatitis B infection with humoral immune response 具有体液免疫应答的乙型肝炎感染延迟细胞群模型的全局稳定性分析
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-18 DOI: 10.1080/14689367.2021.1940868
C. Tadmon, Séverin Foko, A. Rendall
In this work, we propose and investigate a delay cell population model of hepatitis B virus (HBV) infection. We suppose spatial diffusion of free HBV particles, and use a Beddington-DeAngelis incidence function to describe viral infection. The model takes into account the exposed hepatocytes and the usually neglected humoral immune response. Moreover, a time delay is introduced to account for the transformation processes necessary for actual HBV production. We naturally find two threshold parameters, namely the basic reproduction number and the humoral immune response reproduction number which completely determine the global stability of the spatially homogeneous equilibria of the model obtained. By constructing appropriate Lyapunov functionals and using LaSalle's invariance principle we show that, if the disease-free equilibrium is globally asymptotically stable. Furthermore, we prove that the endemic equilibrium without humoral immune response and the endemic equilibrium with humoral immune response are globally asymptotically stable if and respectively. Finally, in one dimensional space, we perform some numerical simulations to illustrate the theoretical results obtained.
在这项工作中,我们提出并研究了乙型肝炎病毒(HBV)感染的延迟细胞群模型。我们假设游离HBV颗粒的空间扩散,并使用Beddington-DeAngelis发病率函数来描述病毒感染。该模型考虑了暴露的肝细胞和通常被忽视的体液免疫反应。此外,引入了时间延迟来解释实际HBV生产所需的转化过程。我们自然地找到了两个阈值参数,即基本繁殖数和体液免疫反应繁殖数,它们完全决定了所获得的模型的空间均匀平衡的全局稳定性。通过构造适当的李雅普诺夫泛函并利用拉萨尔不变性原理,我们证明了如果无病平衡是全局渐近稳定的。此外,我们还证明了没有体液免疫反应的地方病平衡和有体液免疫应答的地方病均衡分别是全局渐近稳定的。最后,在一维空间中,我们进行了一些数值模拟来说明所获得的理论结果。
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引用次数: 4
Local non-periodic order and diam-mean equicontinuity on cellular automata 细胞自动机上的局部非周期序和diam均值等连续性
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-17 DOI: 10.1080/14689367.2022.2106823
Luguis de los Santos Baños, Felipe Garc'ia-Ramos
Diam-mean equicontinuity is a dynamical property that has been of use in the study of non-periodic order. Using some type of ‘local’ skew product between a shift and an odometer looking cellular automaton (CA), we will show that there exists an almost diam-mean equicontinuous CA that is not almost equicontinuous (and hence not almost locally periodic). Previously, we constructed a CA that is almost mean equicontinuous [L.D.I.S. Baños and F. García-Ramos, Mean equicontinuity and mean sensitivity on cellular automata, Ergodic Theory Dynam. Systems 41 (12) (2021), pp. 3704–3721] but not almost diam-mean equicontinuous [L.D.I.S. Baños and F. García-Ramos, Diameter mean equicontinuity and cellular automata, Proceedings of the 27th International Workshop on Cellular Automata and Discrete Complex Systems, arXiv:2106.09641, 2021].
直径平均等连续性是一种动力学性质,在非周期序的研究中有着广泛的应用。使用移位和看起来像里程计的元胞自动机(CA)之间的某种类型的“局部”斜积,我们将证明存在一个几乎直径平均等连续的CA,它不是几乎等连续的(因此也不是几乎局部周期的)。以前,我们构造了一个几乎平均等连续的CA[L.D.I.S.Baños和F.García-Ramos,细胞自动机上的平均等连续性和平均灵敏度,遍历理论动态系统41(12)(2021),pp.3704–3721],但不是几乎直径平均等连续[L.D.is.Baños and F。García-Ramos,Diameter均值等连续性与细胞自动机,第27届细胞自动机与离散复杂系统国际研讨会论文集,arXiv:210609641021]。
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引用次数: 1
Hypercyclicity of weighted translations on locally compact Hausdorff spaces 局部紧化Hausdorff空间上加权平移的超环性
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-13 DOI: 10.1080/14689367.2021.1931814
Ya Wang, Ze‐hua Zhou
Let G be a locally compact second countable Hausdorff space with a positive regular Borel measure and ω is a weight on G. In this article, we provide necessary and sufficient conditions for the hypercyclic weighted translations acting on the weighted space in two different cases. Also, some examples are given to illustrate that the results in the first case generalize the characterizations on hypercyclicity for unilateral weighted shifts studied by Salas [16], and the results in the second case generalize Chen and Chu's work in [8]. Furthermore, we give characterizations of hypercyclicity for adjoint operators of these weighted translations.
设G是具有正正则Borel测度的局部紧致第二可数Hausdorff空间,ω是G上的一个权。本文给出了在两种不同情况下作用于加权空间的超循环加权平移的充要条件。此外,还举例说明了第一种情况下的结果推广了Salas[16]研究的单边加权移位的超循环性特征,第二种情况下结果推广了Chen和Chu在[8]中的工作。此外,我们还刻画了这些加权平移的伴随算子的超循环性。
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引用次数: 1
Physical measures for partially hyperbolic flows with mostly contracting centre 中心大部收缩的部分双曲流的物理措施
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-06 DOI: 10.1080/14689367.2021.1927988
Zeya Mi
In this paper, we study the physical measures for a class of partially hyperbolic flows with mostly contracting centre. Let X be a vector field on a compact Riemannian manifold M with partially hyperbolic splitting . We prove that if the centre direction exhibits the asmptotically sectionally contracting behaviour with respect to Gibbs u-states, then X admits finitely many physical measures, and their basins cover Lebesgue almost all points of the ambient manifold. Moreover, when the unstable manifolds are dense, we prove that X admits only one physical measure whose basin covers a full Lebesgue measure subset. By tracing the physical measures via typical hyperbolic periodic orbits, we study the statistical stability of this kind of partially hyperbolic flows.
本文研究了一类中心大部分收缩的部分双曲型流动的物理措施。设X是紧黎曼流形M上具有部分双曲分裂的向量场。我们证明了如果中心方向相对于吉布斯u态表现出渐近的截面收缩行为,则X允许有限多个物理测度,并且它们的盆覆盖了周围流形的Lebesgue几乎所有点。此外,当不稳定流形很密集时,我们证明了X只允许一个物理测度,其盆覆盖了一个完整的勒贝格测度子集。通过对典型双曲周期轨道物理测度的跟踪,研究了这类部分双曲流的统计稳定性。
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引用次数: 1
Topological pressure for an iterated function system 迭代函数系统的拓扑压力
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-03 DOI: 10.1080/14689367.2021.1929081
Huoyun Wang, X. Liao
In this paper, we introduce a notion of topological pressure, which is different from the LMW's and ML's for an iterated function system. We find out the properties of the topological pressure, which are more similar to the properties of the classical topological pressure than LMW's and ML's. For an iterated function system, we obtain a partial variational principle on topological pressure, which improves the LMW's related result. Finally, we give a lower bound estimation of the topological pressure for a Ruelle-expanding iterated function system. In particular, we point out the exponential growth rate of fixed points is a lower bound of WLLZ's topological entropy for a Ruelle-expanding iterated function system.
在本文中,我们引入了拓扑压力的概念,它不同于迭代函数系统的LMW和ML。我们发现了拓扑压力的性质,它们比LMW和ML更类似于经典拓扑压力的属性。对于迭代函数系统,我们得到了拓扑压力的部分变分原理,改进了LMW的相关结果。最后,我们给出了Ruelle展开迭代函数系统拓扑压力的下界估计。特别地,我们指出不动点的指数增长率是Ruelle展开迭代函数系统的WLLZ拓扑熵的下界。
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引用次数: 0
The dynamics of nonautonomous dynamical systems with the large deviations theorem 用大偏差定理研究非自治动力系统的动力学
IF 0.5 4区 数学 Q4 MATHEMATICS, APPLIED Pub Date : 2021-06-03 DOI: 10.1080/14689367.2021.1926430
Y. Tang, Jiandong Yin
Let be a nonautonomous dynamical system and μ be a Borel measure on X with a full support. The purpose of this paper is to introduce the concepts of large deviations theorem and expansive measure for nonautonomous discrete systems and investigate the dynamics of nonautonomous dynamical systems with the large deviations theorem. Actually, it is proved that is ergodicaly sensitive if the pair satisfies the large deviations theorem and is topologically strongly ergodic; is topologically ergodic if the pair satisfies the large deviations theorem in a sequence of positive integers; μ is expansive if the pair satisfies the large deviations theorem and is topologically strongly ergodic and each measurable set with positive measure with respect to μ has a nonempty interior.
设为非自治动力系统,μ为X上具有完全支持的Borel测度。本文介绍了非自治离散系统的大偏差定理和扩张测度的概念,并用大偏差定理研究了非自治动力系统的动力学问题。事实上,如果对满足大偏差定理并且拓扑上强遍历,则证明了它是遍历敏感的;如果对满足正整数序列中的大偏差定理,则拓扑遍历;μ是扩张的,如果对满足大偏差定理,并且拓扑上强遍历,并且每个相对于μ具有正测度的可测集都具有非空内部。
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引用次数: 0
期刊
Dynamical Systems-An International Journal
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