修正的Chaplygin气体作为非均匀暗能量对宇宙结构形成的影响

发布时间：2018-05-13 16:32

本文选题：MCG暗能量 + 宇宙结构形成　；参考：《辽宁师范大学》2013年硕士论文

【摘要】：当前宇宙正在加速膨胀这一事实已被诸多实验观测所证实,如：重子声学振荡(the baryon acoustic oscillations),对宇宙大尺度结构相关函数的研究,对宇宙微波背景辐射的温度波动角谱的研究。科学工作者们提出了许多方法来解释宇宙的加速膨胀现象,主要的途径有两种：其一为将暗能量(Dark Energy简写做DE)作为新的组份加入到宇宙当中；其二为改写爱因斯坦场方程的左边,也就是修正的引力理论。本文在空间平直宇宙的背景下,对修正的Chaplygin气体(MCG)作为非均匀暗能量对宇宙结构形成的影响进行了研究。在第二章中,我们对现代宇宙学的发展历程做了简要的整理,其中介绍了热大爆炸宇宙学模型并列举几种具有代表性的宇宙学模型。接下来的第三章对宇宙结构形成的机制进行了研究,首先讨论了球坍缩(Spherical Collapse)模型和伪牛顿(Pseudo-Newtonian)理论,总结出在何种条件下两种理论是等价的,而且对求解宇宙中结团数(Number Counts)的Press-Shceter理论进行了研究。第四章为本人在研究生期间的主要工作,首先系统的介绍了MCG暗能量模型的动力学性质,接着通过运用第三章总结的理论基础,展示出MCG暗能量参与结团时密度反差的线性演化和非线性演化情况,最后对结团的MCG暗能量对宇宙中结团数的影响进行了探讨。
[Abstract]:The fact that the universe is expanding rapidly has been confirmed by many experimental observations, such as the baryon acoustic oscillation and the baryon acoustic oscillation, the study of the correlation function of the large scale structure of the universe, and the study of the temperature fluctuation angle spectrum of the cosmic microwave background radiation. Scientists have proposed many ways to explain the accelerating expansion of the universe. There are two main ways: one is to add dark Energy to the universe as a new component; The second is to rewrite Einstein's field equation to the left, that is, the modified theory of gravity. In this paper, the influence of the modified Chaplygin gas on the formation of the cosmic structure as a non-uniform dark energy is studied under the background of the spacial flat universe. In the second chapter, we make a brief arrangement of the development of modern cosmology, in which we introduce the hot Big Bang cosmology model and enumerate several representative cosmological models. In the third chapter, the mechanism of the formation of the structure of the universe is studied. Firstly, the spherical collapse model and pseudo-Newtonian theory are discussed, and the conditions under which the two theories are equivalent are summarized. Furthermore, the Press-Shceter theory for solving the number of clusters in the universe is studied. The fourth chapter is my main work in graduate school. Firstly, the dynamic properties of MCG dark energy model are introduced systematically, and then the theoretical basis of chapter three is used. The linear and nonlinear evolution of density contrast is shown when MCG dark energy is involved in cluster formation. Finally, the influence of MCG dark energy on the number of clusters in the universe is discussed.
【学位授予单位】：辽宁师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P159

【共引文献】