Brans-Dicke理论下全息起源相互作用的时间变化宇宙学常数

发布时间：2018-01-01 23:35

本文关键词：Brans-Dicke理论下全息起源相互作用的时间变化宇宙学常数　出处：《辽宁师范大学》2014年硕士论文　论文类型：学位论文

【摘要】：根据Ia型超新型[1-2]的观测数据并结合宇宙背景辐射[3-4]和SDSS[5-6]的观测表明：我们当前的宇宙正处于加速膨胀的阶段。解释宇宙加速膨胀的原因成为众多天文物理学者的研究热点。物理学者们通常主要应用两种途径来解释宇宙加速膨胀这一现象：一种是引入暗能量这一新的宇宙成分，另一种是修改爱因斯坦场方程的左边，即修正的引力理论。本文首先简要介绍了宇宙学的背景知识及主要方程。然后列举了几个解释宇宙加速的暗能量模型。在文章的第四部分主要阐述了本人研究生期间的工作，即我们研究了Brans-Dicke理论下具有全息起源的相互作用时间变化宇宙学常数暗能量模型。在这个模型下，，我们讨论了宇宙演化的一些性质。具体讨论中，我们通过探讨宇宙学量相对模型参数的依赖关系，对Brans-Dicke引力理论与爱因斯坦广义相对论引力理论加以比较，并且也讨论有无相互作用情况对宇宙演化的影响。研究表明在这个模型中可以实现宇宙从减速膨胀到加速膨胀的转变，以及暗能量态方程的演化可以穿过phantom边界线。另外，jerk参数的几何诊断方法也被应用来区分Brans-Dicke理论下相互作用的时间变化宇宙学常数模型和流行的宇宙学常数模型。
[Abstract]:According to the Ia super new model. [1-2] observations combined with cosmic background radiation. [3-4] and SDSS. [Observations from 5-6 show that:. Our current universe is at the stage of accelerating expansion. Explaining the cause of the accelerated expansion of the universe has become a hot topic for many astrophysicists. Physicists usually mainly use two ways to explain the accelerated expansion of the universe. A phenomenon:. One is the introduction of dark energy, a new cosmic component. The other is to modify the left side of Einstein's field equation, the modified gravitational theory. In this paper, the background knowledge and main equations of cosmology are briefly introduced, and then several dark energy models to explain the acceleration of the universe are listed. In the 4th part of this paper, I mainly describe my work during the graduate school. That is, we study the interaction time variation cosmological constant dark energy model with holographic origin in Brans-Dicke theory. We discuss some properties of the evolution of the universe. In the discussion, we discuss the dependence of cosmological quantities on the parameters of the model. A comparison between Brans-Dicke 's gravitation theory and Einstein's theory of general relativistic gravity is made. The influence of interaction on the evolution of the universe is also discussed. It is shown that the transformation of the universe from decelerating expansion to accelerating expansion can be realized in this model. And the evolution of the dark energy equation of state across the phantom boundary. The geometric diagnosis method of jerk parameters should also be used to distinguish the time-varying cosmological constant model of interaction under Brans-Dicke theory from the prevailing cosmological constant model.
【学位授予单位】：辽宁师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P159

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