Brans-Dicke宇宙中暗能量及其热力学描述

发布时间：2018-01-28 05:11

本文关键词： 全息暗能量 Agegraphic暗能量 Brans-Dicke引力理论热力学　出处：《辽宁师范大学》2012年硕士论文　论文类型：学位论文

【摘要】：近些年来,通过对Ia型超新星的观测,以及对宇宙微波背景辐射和大尺度结构的精确数据分析表明宇宙正在加速膨胀。如何解释宇宙的加速膨胀已成为目前的热门问题之一。解释这一问题的理论主要有两种,一种是对Einstein引力场方程的左边-时空几何部分修正,即引力修正理论.另一种是认为宇宙中存在负压强的奇异物质-暗能量,它提供排斥作用以抵消引力效应.现有的解释宇宙加速膨胀的暗能量模型有很多种,它们各有其优势或不足。本文首先介绍了现代宇宙学的背景知识,常见的暗能量模型,以及黑洞热力学的基础知识.然后在Brans-Dicke理论下,对全息暗能量模型和新Agegraphic暗能量模型进行了详细的研究,分别给出了这两个模型的态参数、减速参数的演化方程.经过分析我们发现,对于Brans-Dicke理论下的这两个模型,如果选择适当的参数,1'hantom穿越就能够实现。它们不仅能够更好的解释宇宙的加速膨胀,而且能够退化到Einstein理论下的形式。暗物质和暗能量之间的相互作用,在热力学上被描述为热平衡状态下一个小的涨落,因此我们又对它们进行了热力学分析,得到了暗物质和暗能量的相互作用项与热力学涨落之间的关系,并且,这一关系也能够退化到Einstein理论下的形式.
[Abstract]:In recent years, observations of the Ia supernova have been made. Accurate data analysis of cosmic microwave background radiation and large scale structure shows that the universe is expanding rapidly. How to explain the accelerating expansion of the universe has become one of the hot issues at present. The theory of explaining this problem is the main theory. There are two. One is to modify the left-side space-time geometric part of the Einstein gravitational field equation, that is, the gravitational correction theory, and the other is to think that there is a singular matter in the universe with strong negative pressure-dark energy. It provides repulsion to counteract gravitational effects. There are many existing dark energy models to explain the accelerating expansion of the universe, each of which has its advantages or disadvantages. This paper first introduces the background knowledge of modern cosmology, the common dark energy models, and the basic knowledge of black hole thermodynamics, and then under the Brans-Dicke theory. The holographic dark energy model and the new Agegraphic dark energy model are studied in detail. The evolution equations of the state parameters and deceleration parameters of the two models are given respectively. For the two models based on Brans-Dicke theory, if we choose the appropriate parameters to traverse the model, they can not only better explain the accelerating expansion of the universe. The interaction between dark matter and dark energy is thermodynamically described as a small fluctuation in the state of thermal equilibrium. Therefore, we have carried on the thermodynamic analysis to them again, obtained the relation between the interaction term of dark matter and dark energy and the thermodynamic fluctuation, and. This relationship can also degenerate into the form of Einstein theory.
【学位授予单位】：辽宁师范大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P159

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