Agegraphic暗能量模型的理论研究

发布时间：2018-06-13 11:49

  本文选题：宇宙加速膨胀 + agegraphic暗能量　； 参考：《东北大学》2010年硕士论文

【摘要】：自从1998年两个超新星观测团队分别独立地发现今天的宇宙正在加速膨胀以来,暗能量问题就成为了物理学和天文学研究中最为重要的问题之一。在引言中,概述了暗能量的研究背景及暗能量问题的研究现状。第二章中,从宇宙动力学谈起,介绍了对宇宙加速膨胀的几种诠释,其中包括宇宙学常数模型、动力学标量场暗能量模型(包括精质、幽灵和精灵模型)、全息暗能量模型及修正的引力理论。第三章中,主要研究Brans-Dicke理论框架下的新agegraphic暗能量模型。Agegraphic暗能量模型是结合量子力学中的海森堡不确定性原理和广义相对论中的引力效应而提出的一种模型。在Brans-Dicke理论框架下,我们主要研究了新agegraphic暗能量模型的动力学演化行为,推导了新agegraphic暗能量的密度参量、状态方程参量和宇宙减速因子的具体表达形式,发现agegraphic暗能量能实现类精灵行为,即状态方程参量在演化过程中能穿越-1。对比了在Brans-Dicke理论和爱因斯坦理论框架下新agegraphic暗能量的演化行为,另外,探究了相互作用的新agegraphic暗能量模型的演化行为。除此之外,还应用弱引力猜测的结果,即精质标量场φ的变化量的绝对值小于等于普朗克质量Mp,对agegraphic精质模型中的参量n进行了可能的理论限制,得出的模型参量n的理论上限为n≤2.5,这与当前的观测限制结果2.637n2.983(95.4%置信度)不一致。最后讨论了产生这种理论限制结果与当前的观测限制结果的显著差异的可能原因。
[Abstract]:Since 1998, when two supernova observation teams independently discovered that today's universe is expanding rapidly, dark energy has become one of the most important problems in physics and astronomy. In the introduction, the background of dark energy and the research status of dark energy are summarized. In the second chapter, we introduce several interpretations of the accelerating expansion of the universe, including the cosmological constant model, the kinetic scalar field dark energy model (including fine matter). Ghost and Elf models, holographic dark energy models and modified gravitational theory. In the third chapter, the new agegraphic dark energy model. The age graphic dark energy model under the Brans-Dicke theory is a model proposed combining the Heisenberg uncertainty principle in quantum mechanics and the gravitational effect in general relativity. In the frame of Brans-Dicke 's theory, we mainly study the dynamic evolution of the new agegraphic dark energy model, and derive the density parameter, state equation parameter and cosmic deceleration factor of the new agegraphic dark energy. It is found that the agegraphic dark energy can realize the elf-like behavior, that is, the state equation parameters can traverse -1 in the evolution process. The evolution behavior of the new agegraphic dark energy under the framework of Brans-Dicke theory and Einstein theory is compared. In addition, the evolution behavior of the new agegraphic dark energy model is explored. In addition, by using the result of weak gravity guess, that is, the absolute value of the variation of the fine scalar field 蠁 is less than or equal to the Planck mass MP, the parameter n in the agegraphic seminal model is theoretically restricted. The theoretical upper limit of the model parameter n is n 鈮，

本文编号：2013926