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QUANTUM REVIVALS AND FRACTALITY FOR THE SCHRÖDINGER EQUATION 薛定谔方程的量子复兴与分形
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-04-01 DOI: 10.1016/S0034-4877(24)00022-3
Gunwoo Cho, Jimyeong Kim, Ihyeok Seo, Seongyeon Kim, Yehyun Kwon

We investigate the behavior of the Schrödinger equation under the influence of potentials, focusing on its relationship to quantum revivals and fractality. Our findings reveal that the solution displays fractal behavior at irrational times, while exhibiting regularity similar to the initial data at rational times. These extend the results of Oskolkov [16] and Rodnianski [18] on the free Schrödinger evolution to the general case regarding potentials.

我们研究了薛定谔方程在电势影响下的行为,重点是它与量子复兴和分形的关系。我们的研究结果表明,解在非理性时间表现出分形行为,而在理性时间则表现出与初始数据类似的规律性。这将 Oskolkov [16] 和 Rodnianski [18] 关于自由薛定谔演化的结果扩展到了关于势的一般情况。
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引用次数: 0
CHAIN TRANSITIVITY AND SHADOWING PROPERTY IN QUANTUM DYNAMICAL SYSTEMS 量子动力学系统中的链传递性和阴影特性
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-04-01 DOI: 10.1016/S0034-4877(24)00026-0
Mona Khare, Ravi Singh Chauhan

In the present paper we investigate the notions of chain transitivity, ε-shadowing and expansiveness in the dynamics of quantum measure spaces (P, μ). Besides of several results proved for a chain transitive quantum dynamical system, it is shown that if a measure preserving morphism φ on (P, μ) is chain mixing, then φn is chain transitive for each n ∊ ℕ. The present study also elucidates interrelationship between ε-shadowing and expansiveness of a quantum dynamical system (P, μ, φ) under suitable conditions. Examples are given to support the theory.

本文研究了量子度量空间(P,μ)动力学中的链传递性、ε阴影和广延性概念。除了证明了链传递性量子动力学系统的几个结果之外,还证明了如果(P, μ)上的度量保持态φ是链混合的,那么对于每个 n ∊ ℕ,φn 都是链传递性的。本研究还阐明了量子动力学系统(P, μ, φ)在适当条件下的ε阴影和扩张性之间的相互关系。举例说明了这一理论。
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引用次数: 0
SINGULAR REDUCTION OF CONTACT HAMILTONIAN SYSTEMS 接触哈密顿系统的奇异还原
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-04-01 DOI: 10.1016/S0034-4877(24)00029-6
Qianqian Xia

We study singular reduction of contact Hamiltonian systems acted upon properly by a Lie group. The tools we use are the category of differential space.

我们研究由一个李群适当作用的接触哈密顿系统的奇异还原。我们使用的工具是微分空间范畴。
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引用次数: 0
INVERSE SOURCE PROBLEM FOR SUBDIFFUSION EQUATION WITH A GENERALIZED IMPEDANCE BOUNDARY CONDITION 具有广义阻抗边界条件的亚扩散方程的反源问题
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-04-01 DOI: 10.1016/S0034-4877(24)00025-9
Mansur I. Ismailov, Muhammed Çiçek

The paper considers an inverse problem for a one-dimensional time-fractional subdiffusion equation with a generalized impedance boundary condition. This boundary condition is given by a second-order spatial differential operator imposed on the boundary. The inverse problem is the problem of determining the time dependent source parameter from the energy measurement. The well-posedness of the inverse problem is established by applying the Fourier expansion in terms of eigenfunctions of a spectral problem which has the spectral parameter also in the boundary condition, Volterra type integral equation with the kernel may have a diagonal singularity and fractional type Gronwall inequality.

本文研究了一个具有广义阻抗边界条件的一维时分亚扩散方程的逆问题。该边界条件由施加在边界上的二阶空间微分算子给出。逆问题是根据能量测量确定随时间变化的源参数的问题。逆问题的良好求解性是通过应用谱问题特征函数的傅立叶展开来确定的,该谱问题的边界条件中也包含谱参数、核可能具有对角奇异性的 Volterra 型积分方程以及分数型 Gronwall 不等式。
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引用次数: 0
NEW QUANTUM CODES DERIVED FROM THE DIRECT PRODUCT OF RINGS, USING CYCLIC CODES OVER THE RING 利用环上的循环码,从环的直接乘积推导出新的量子密码
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-04-01 DOI: 10.1016/S0034-4877(24)00027-2
Pooja Soni, Manju Pruthi, Arun Kumar Yadav

This research paper discusses the construction of novel and better quantum codes from the direct product of t-copies of ring R (discussed in Section 2), using cyclic codes over R by employing the CSS construction technique. Here, we present an overview of the structure and essential properties of a ring R. Furthermore, we analyze the distance-preserving nature of the Gray map in Subsection 2.1. Here, we also investigate maximum distance separable (MDS) codes by using the concept of quantum singleton defect (QSD), which indicates the overall quality of codes. To demonstrate the practicality of our findings, we provide illustrative examples implemented using the Magma software.

本研究论文讨论了通过使用 CSS 构建技术,利用环 R 上的循环码,从环 R 的 t 副本的直接乘积(在第 2 节中讨论)构建新颖且更好的量子编码。此外,我们在第 2.1 小节中分析了格雷映射的距离保留性质。在这里,我们还利用量子单子缺陷(QSD)的概念研究了最大距离可分离(MDS)编码,它表示编码的整体质量。为了证明我们研究结果的实用性,我们提供了使用 Magma 软件实现的示例。
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引用次数: 0
RICCI SOLITONS AND RICCI BI-CONFORMAL VECTOR FIELDS ON THE LIE GROUP ℍ2 × ℝ 里奇孤子和里奇双共形矢量场上的谎群ℍ2 × ℝ
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-04-01 DOI: 10.1016/S0034-4877(24)00028-4
Shahroud Azami, Mehdi Jafari

In the present paper, we investigate the 3-dimensional Lie group (ℍ2 × ℝ, g) where g is a left-invariant Riemannian metric and we determine the Ricci solitons and Ricci bi-conformal vector fields on it.

在本文中,我们研究了三维李群(ℍ2 × ℝ,g),其中 g 是左不变黎曼度量,并确定了其上的利玛窦孤子和利玛窦双共形矢量场。
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引用次数: 0
New regularity criteria for an MHD Darcy-Forchheimer fluid 多流体力学达西-福克海默流体的新规则性标准
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-02-01 DOI: 10.1016/S0034-4877(24)00008-9
Saeed ur Rahman, José Luis Díaz Palencia

The purpose of the presented article is to develop some new global regularity criteria for a magnetohydrodynamic (MHD) fluid flowing in a saturated porous medium. The effect of the porous medium, over the fluid flow, is characterized by a Darcy–Forchheimer law. The fluid, under study, is considered as one-dimensional and flowing in the x–direction with velocity component u. In addition, such a component is assumed to vary with the y–direction, i.e. u(y). Then, given the vorticity functionw=-uy, such thatwBMO2 is sufficiently small, we develop the regularity criteria under the scope of the L2 space. We extend our results to the spaces Ls, where s > 2. Afterward, we prove the Liouville-type theorem for the MHD Darcy–Forchheimer flow equation. Eventually, we obtain some characterization about the asymptotic behaviour of solutions, particularly, the nonuniform convergence in L2 fort.

本文旨在为在饱和多孔介质中流动的磁流体(MHD)制定一些新的全局正则准则。多孔介质对流体流动的影响以达西-福克海默定律为特征。所研究的流体被视为一维流体,沿 x 方向流动,速度分量为 u。然后,给定涡度函数w=-∂u∂y,使得 "w "BMO2 足够小,我们在 L2 空间范围内建立正则准则。之后,我们证明了 MHD 达西-福克海默流动方程的柳维尔定理。最后,我们获得了关于解的渐近行为的一些特征,特别是在 L2 fort→∞ 中的非均匀收敛。
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引用次数: 0
Galilean and Carrollian Hodge star operators 伽利略和卡罗尔霍奇星算子
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-02-01 DOI: 10.1016/S0034-4877(24)00007-7
Marián Fecko

The standard Hodge star operator is naturally associated with metric tensor (and orientation). It is routinely used to concisely write down physics equations on, say, Lorentzian spacetimes. On Galilean (Carrollian) spacetimes, there is no canonical (nonsingular) metric tensor available. So, the usual construction of the Hodge star does not work. Here we propose analogs of the Hodge star operator on Galilean (Carrollian) spacetimes. They may be used to write down important physics equations, e.g. equations of Galilean (Carrollian) electrodynamics.

标准霍奇星算子与度量张量(和方向)天然相关。它通常用于简明地写出洛伦兹时空的物理方程。而在伽利略(卡罗尔)时空,则没有正则(非ingular)度量张量可用。因此,通常的霍奇星构造不起作用。在这里,我们提出了伽利略(卡罗尔)时空的霍奇星算子的类似物。它们可以用来写出重要的物理方程,例如伽利略(卡罗尔)电动力学方程。
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引用次数: 0
Lie integrability by quadratures for symplectic, cosymplectic, contact and cocontact Hamiltonian systems 交折射、余折射、接触和共接触哈密顿系统的四元数的列积分性
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-02-01 DOI: 10.1016/S0034-4877(24)00009-0
R. Azuaje

In this paper we present the theorem on Lie integrability by quadratures for time-independent Hamiltonian systems on symplectic and contact manifolds, and for time-dependent Hamiltonian systems on cosymplectic and cocontact manifolds. We show that having a solvable Lie algebra of constants of motion for a Hamiltonian system is equivalent to having a solvable Lie algebra of symmetries of the vector field defining the dynamics of the system, which allows us to find solutions of the equations of motion by quadratures.

在本文中,我们提出了交错流形和接触流形上与时间无关的哈密顿系统,以及共交错流形和共接触流形上与时间有关的哈密顿系统的Lie积分性定理。我们证明,哈密顿系统运动常数的可解李代数等同于定义系统动力学的矢量场对称性的可解李代数,这使我们能够通过正交找到运动方程的解。
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引用次数: 0
Zero-error correctibility and phase retrievability for twirling channels 旋转信道的零误差可纠正性和相位可检索性
IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2024-02-01 DOI: 10.1016/S0034-4877(24)00012-0
Deguang Han, Kai Liu

A twirling channel is a quantum channel induced by a continuous unitary representationπ=imiπi on a compact group G, where πi are inequivalent irreducible representations. Motivated by a recent work [8] on minimal mixed unitary rank of Φπ, we explore the connections of the independence number, zero-error capacity, quantum codes, orthogonality index and phase retrievability of the quantum channel Φπ with the irreducible representation multiplicities mi and the irreducible representation dimensions dimHπi. In particular, we show that the independence number of Φπ is the sum of the multiplicities, the orthogonal index of Φπ is exactly the sum of those representation dimensions, and the zero-error capacity is equal to log(i=1dmi). We also present a lower bound for the phase retrievability in terms of the minimal length of phase retrievable frames for ℂn

扭转信道是由紧凑群 G 上的连续单元表示π=∑i⊕miπi 所诱导的量子信道,其中 πi 是不等价的不可还原表示。受最近关于 Φπ 的最小混合单元秩的研究[8]的启发,我们探讨了量子信道 Φπ 的独立数、零错误容量、量子密码、正交指数和相位可检索性与不可还原表征乘数 mi 和不可还原表征维数 dimHπi 之间的联系。我们特别指出,Φπ 的独立数是乘数之和,Φπ 的正交索引正好是这些表示维数之和,零误差容量等于 log(∑i=1dmi)。我们还根据ℂn 的相位可检索帧的最小长度提出了相位可检索性下限。
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Reports on Mathematical Physics
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