相互作用的全息暗能量及精质的局域影响

发布时间：2018-04-24 15:35

本文选题：全息暗能量 + statefinder参数　；参考：《大连理工大学》2010年博士论文

【摘要】： 1998年超新星的观测发现宇宙正处于加速膨胀阶段,随后的诸多观测如威尔金森微波各向异性探测器、宇宙微波背景辐射、斯隆数字天宇测量和宇宙大尺度结构等天文观测数据均证实了这一现象。而推动这一加速的理论机制是需要宇宙含有一种具有负压强的介质,由于其在大尺度范围内不结团,弥漫在整个宇宙空间,所以被称为“暗能量”。为此,人们构造了众多的暗能量模型来描述宇宙的加速膨胀。最简单的是宇宙学常数模型,动力学标量场模型的状态方程参数可以随时间演化,还有通过改变时空的几何结构来实现宇宙加速膨胀的修正引力理论。近来,量子引力研究的一个重要结果——全息原理被应用到了宇宙学中,产生了全息暗能量模型。因为从本质上说,暗能量问题应该是一个量子引力问题,因此全息暗能量模型可能具有暗能量基本理论的某些重要特征。本文首先以一种具有一般形式的全息暗能量模型为基础,将其拓展到暗能量与暗物质存在相互作用的情形。在一定边界条件下,我们给出了相互作用模型中重要参数的解析形式和最佳拟合值。从其演化行为中,可见这种模型能够解决精细调节、宇宙巧合、因果性等问题,而且保持了全息暗能量一系列模型的形式一致性。此外,当考虑有效状态方程时,它同样可避免宇宙的大撕裂。然而,由于暗能量模型越来越多,对这些多样的理论模型进行敏感而有效的区分与鉴别就变得十分重要。Statefinder参数便是这样一种诊断方法。我们应用statefinder参数对上述的相互作用全息暗能量的行为进行了诊断分析,结果表明存在相互作用的全息模型更接近其他全息暗能量模型的行为方式,因此更具有代表性。另一方面,把暗能量看作一种宇宙组分,将其与Einstein场方程联合,能够处理一些局域引力问题,如一些有关黑洞性质的研究。我们利用Kiselev于2003年提出的一个Einstein场方程的静态球对称精确解,研究在包含quintessence暗能量的Schwarzschild时空度规下,双体系统中试验质量的运动轨迹及其轨道在某些条件下的进动角,以考察quintessence在局域引力场中的影响。随着天文观测技术的发展,这些结果可以作为探测暗能量是否存在的理论工具。
[Abstract]:The observation of supernova in 1998 found that the universe is in an accelerating expansion stage, and many subsequent observations, such as the Wilkinson microwave anisotropy detector, cosmic microwave background radiation, This phenomenon is confirmed by astronomical observations such as the Sloan Digital Skyspace Survey and the large scale structure of the universe. The theoretical mechanism to promote this acceleration is that the universe contains a medium with strong negative pressure, which is called "dark energy" because it does not form clusters in large scale and pervades the whole space. To this end, many dark energy models have been constructed to describe the accelerating expansion of the universe. The simplest is the cosmological constant model. The parameters of the state equation of the dynamic scalar field model can evolve with time, and the modified gravitational theory of accelerating the expansion of the universe can be realized by changing the geometric structure of space and time. Recently, holographic principle, an important result of quantum gravitation, has been applied to cosmology and generated holographic dark energy model. Because in essence the dark energy problem should be a quantum gravitational problem, the holographic dark energy model may have some important characteristics of the basic theory of dark energy. Based on a holographic dark energy model with general form, this paper extends it to the case of the interaction between dark energy and dark matter. Under certain boundary conditions, the analytical form and the best fitting value of the important parameters in the interaction model are given. From its evolution behavior, we can see that this model can solve the problems of fine adjustment, cosmic coincidence, causality and so on, and it also maintains the formal consistency of a series of models of holographic dark energy. Moreover, when the effective equation of state is considered, it can also avoid a big tear in the universe. However, due to the increasing number of dark energy models, it is very important to distinguish and distinguish these various theoretical models sensitively and effectively. The Statefinder parameter is such a diagnostic method. We use the statefinder parameter to diagnose and analyze the interaction holographic dark energy behavior. The results show that the holographic model with interaction is closer to the behavior of other holographic dark energy models, so it is more representative. On the other hand, considering dark energy as a cosmic component and combining it with the Einstein field equation, we can deal with some local gravitational problems, such as some studies on the properties of black holes. By using the exact solution of static spherical symmetry of a Einstein field equation proposed by Kiselev in 2003, we study the trajectory of the experimental mass and the precession angle of its orbit under some conditions under the Schwarzschild space-time metric with quintessence dark energy. The effect of quintessence on local gravitational field is investigated. With the development of astronomical observation technology, these results can be used as a theoretical tool to detect the existence of dark energy.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2010
【分类号】：P145.9

【共引文献】