尘埃粒子的时空结构及其性质

讨论了尘埃粒子解的时空结构及其性质，导出了尘埃粒子的内空间的离散结构.证明了尘埃粒子内部的物质球是一个无坐标的平直球，因而具有最小的体积和整体的关联性.导出了在尘埃粒子的内外时空中的径向测地线并说明其连续性.阐述了由这个解所揭示的物质、引力与时空之间的内在联系. 关键词： 尘埃粒子 离散时空 测地线     

离散时空的Friedmann宇宙的几何结构及其性质

研究了离散时空的Friedmann宇宙的几何结构,证明了形成Friedmann宇宙的尘埃物质并不分布在Friedmann时空点上,导出了在Friedmann宇宙中的试验粒子的测地运动方程,并揭示了Friedmann宇宙中的时钟和频移效应. 关键词： Friedmann时空 尘埃物质 测地运动 时频效应     

时空泡沫结构与量子电动力学中发散的消除

时空的泡沫结构将在量子电动力学中产生新的顶角，它们正好可以抵消量子电动力学中三种最低阶的原始发散. 关键词：     

HL-1M装置锯齿活性的时空结构分析

等离子体中心的MHD现象可以用软X射线针孔相机进行观测。在HL-1M装置上我们建立了一套由3个软X射线针孔相机共60道探测弦组成的探测系统。奇异值分解(SVD)方法能将信号分解成正交的空间和时间两组本征向量，并且可以将复杂的时空成份分离开来，使各种不同成份的空间结构和时间演变规律一一对应，从而便于了解MHD现象的重复时间和特征半径。     

输运与撕裂模相互作用下等离子体的时空结构

本文应用等离子体一维输运模型与撕裂模理论,对于不同的输运模型和托卡马克放电参数下撕裂模的演变进行了数值研究。结果表明,能量过程是影响等离子体宏观稳定性行为的一个不可低估的重要因素,它们与磁流体稳定性的相互影响,会使其磁流体形态构成多种时间或空间结构,等离子体温度、密度等宏观参量也将表现出不同的时空特征。 关键词：     

基于时空滤波理论的低频声场干涉结构研究

基于时空滤波理论, 采用相干函数、功率响应函数、扩展分布函数、双频函数四个系统函数较波导不变量更全面地描述了低频声场的相干结构. 理论分析、仿真研究和海试数据处理都验证了低频声场存在稳定的干涉结构, 当目标由远及近、又由近及远做匀速直线运动时, 相干函数(LOFAR图)的干涉结构为一簇类双曲线; 功率响应函数的干涉图表征了简正波群时延的差分, 体现了其频散特性; 扩展分布函数能反映LOFAR图上干涉条纹的斜率大小; 而双频函数能体现相慢度的差分. 各个系统函数均能特别突出干涉结构的某方面的特征, 各有特色.     

Anti-de Sitter时空中黑洞量子熵的发散结构

用“brick- wall”模型研究了Anti-de Sitter时空中起源于电磁和引力场的黑洞量子熵的发散结构, 结果表明量子熵由线性发散项和对数发散项构成. 如果平衡温度选为Hawking温度，固有截断替代坐标截断，则线性发散项可化为正比于事件视界面积的形式；而对数发散项不仅依赖于黑洞的特征，也依赖于场的自旋，由于此项的存在，自旋场的贡献不再与标量场的贡献成正比. 关键词： 发散结构 黑洞熵 AdS时空 电磁和引力场     

糖酵解模型差速流动引起的不稳定性和时空结构

建立了糠酵解模型（Selkov模型）差速流动型反应扩散方程,理论研究 了均匀定态的稳定性,结果表明,当自催化物B的流速φ大于临界值φc时,系统存在运流不稳定性（Convective instability);数值模拟分别得到了B在不同时刻和不同流速φ下的时空结构,显示了一些特殊,性质同时也证实了运流不稳定性的存在。     

节点结构互异的复杂网络的时空混沌反同步

研究了节点结构互异的离散型时空混沌系统构成复杂网络的反同步问题. 通过构造合适的Lyapunov函数, 确定了复杂网络中连接节点之间的耦合函数的结构以及控制增益的取值范围. 以物理中具有时空混沌行为的激光相位共轭波空间扩展系统、Gibbs电光时空混沌 模型、Bragg声光时空混沌模型以及一维对流方程的离散形式作为 网络节点构成的复杂网络为例进行了仿真模拟, 发现整个网络存在稳定的混沌反同步现象.     

激光频带宽度对二次谐波时空分辨结构的影响

本文报道用条纹相机在沿与激光光轴成90°方向拍摄的二次谐波发射的时空分辨结构,宽频带激光打靶与窄频带激光打靶表现出明显的差异,用孤立波产生理论进行分析,得出与实验基本相符的结果。 关键词：     

Projective spacetime

It is suggested that the world is locally projectively flat rather than Euclidean. From this postulate it is shown that an (N+1)-particle system has the global geometry of the symmetric spaceSO(4,N+1)/SO(4)×SO(N+1). A complex representation also exists, with structureSU(2,N+1)/S[U(2)×U(N+1)]. Several aspects of these geometrics are developed. Physical states are taken to be eigenfunctions of the Laplace-Beltrami operators. The theory may provide a rational basis for comprehending the groupsSO(4, 2),SU(2)×U(1),SU(3), etc., of current interest.     

Quantum spacetime

After a review and reformulation of previous results, further developments in the construction and interpretation of a quantum-theoretic model of general relativistic spacetime are presented. A theorem is proved that clarifies the nature of the boundaries separating the four-dimensional facets of the resulting piecewise linear model, and a simple example of such a spacetime is detailed. The precise way in which any such model unifies the essential features of both quantum theory and general relativity is discussed.     

Nonequilibrium thermodynamics of spacetime

It has previously been shown that the Einstein equation can be derived from the requirement that the Clausius relation dS=deltaQ/T hold for all local acceleration horizons through each spacetime point, where is one-quarter the horizon area change in Planck units and deltaQ and T are the energy flux across the horizon and the Unruh temperature seen by an accelerating observer just inside the horizon. Here we show that a curvature correction to the entropy that is polynomial in the Ricci scalar requires a nonequilibrium treatment. The corresponding field equation is derived from the entropy balance relation dS=deltaQ/T+diS, where diS is a bulk viscosity entropy production term that we determine by imposing energy-momentum conservation. Entropy production can also be included in pure Einstein theory by allowing for shear viscosity of the horizon.     

Noncontinuous Minkowskian spacetime

A model for a noncontinuous spacetime is considered, which is based on a generalization of the manifold concept, known as d-space. As a consequence of its construction, the model possesses a metric of Lorentzian signature and a generalized form of Lorentz invariance. The model may be considered as defining a class of discrete spacetimes within the framework of the d-space representation of general relativity.     

Generalised splitting of spacetime

Normally, when a spacetime splitting is considered the ADM 3+1 split is brought to mind. In this paper, the idea of spacetime splitting is extended to include anm + n splitting of spacetime. The global spacetime has dimension (m + n) and the foliating spaces have dimensionm. There aren independent normals to each of these foliating spaces, thus givingn different extrinsic curvatures. The generalised Gauss-Weingarten and the generalised Gauss-Codazzi equations associated with this splitting are derived. These generalised equations reduce to the familar ADM equations when a 3+1 split is considered. The generalised equations are found to have a particularly elegant form when an orthogonal splitting of spacetime is examined.     

Bosonization in curved spacetime

The bosonization of a pair of two-dimensional Weyl fermions, of opposite chiralities, is considered. When the fermions are in different metrics the bosonization procedure gives a unique expression for the gravitational anomaly.     

Trips in Kerr-NUT spacetime

With reference to the recently published article (Abdujabbarov et al. in Gen Relativ Gravit 40:2515–2532, 2008), we question the correctness of the method employed and the physical consistency of the claimed results.     

Parton coalescence and spacetime

The influence of spacetime dynamics in hadronization via parton coalescence at RHIC is investigated using covariant parton transport theory: Key observables, the quark number scaling of elliptic flow and the enhancement of the p/π ratio, show strong dynamical effects and differ from earlier results based on the simple coalescence formulas.