关于非平直宇宙中新Agegraphic暗能量的研究

发布时间：2018-04-02 06:12

本文选题：暗物质　切入点：Agegraphic暗能量　出处：《辽宁师范大学》2010年硕士论文

【摘要】： 近年来,人们对Ia型超新星、宇宙微波背景以及大尺度结构的观测和研究都表明了这样一个事实:我们的宇宙目前正在加速膨胀。解释宇宙的加速膨胀也成为近期的热门问题之一。人们已经提出多种理论来解释这一事实,其中最好的还属暗能量理论。这一理论认为宇宙中存在一种压强为负的奇异“物质”,它提供了排斥作用以抵消引力效应,因此驱动宇宙加速膨胀,这就是暗能量。现有的暗能量模型有很多种,它们都是解释宇宙加速膨胀的候选者,也都有各自的优势或缺陷。本文在非平直宇宙的背景下,对有相互作用的新Agegraphic暗能量模型进行了更深入的研究。我们选取三种相互作用形式,分别给出该模型密度参数、态方程和减速参数的演化方程和图像。通过比较,我们认为取Γ= 3b~2Hρ_q时,该模型的各参数与观测符合较好,其态方程也能够穿越-1。之后,我们在这种相互作用形式下对该模型进行了几何诊断,即statefinder诊断和Om诊断,并将演化轨迹显示在r - s、r - q、w_q' - w_q和Om平面中。通过分析我们发现,常数n和b~2在新Agegraphic暗能量模型的演化过程中扮演了重要角色,它们直接影响宇宙学量的演化。此外,通过诊断图像我们可以直观地看出该模型在有相互作用和无相互作用情况下的差别,还可用Om诊断法找出新旧Agegraphic暗能量模型以及LCDM模型之间的不同之处。
[Abstract]:In recent years, there has been a reaction to the Ia supernova, Observations and studies of the cosmic microwave background and large scale structures reveal the fact that our universe is currently expanding at an accelerated rate. Explaining the accelerated expansion of the universe has also become one of the hot issues of the recent past. Put forward a variety of theories to explain this fact, The best of these is the theory of dark energy, which states that there is a singular "substance" in the universe with negative pressure, which provides repulsion to counteract gravitational effects, and thus drives the universe to expand more rapidly. This is the dark energy. There are many kinds of dark energy models, which are candidates for explaining the accelerating expansion of the universe, and each has its own advantages or disadvantages. In this paper, the new Agegraphic dark energy model with interaction is studied more deeply under the background of non-straight universe. We select three kinds of interaction forms and give the density parameters of the model. The evolution equations and images of equation of state and deceleration parameter. By comparison, we think that when 螕 = 3b~2H 蟻 Q, the parameters of the model are in good agreement with the observation, and the equation of state can also pass through -1. In this form of interaction, we make geometric diagnosis of the model, that is, statefinder diagnosis and Om diagnosis, and show the evolution locus in the plane of r sn r QN WQ Q and Om. Through the analysis, we find that, Constants n and bn play an important role in the evolution of the new Agegraphic dark energy model, and they directly affect the evolution of cosmological quantities. Through the diagnostic images we can directly see the difference between the model with and without interaction. The Om diagnostic method can also be used to find out the difference between the old and new Agegraphic dark energy model and the LCDM 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】：2010
【分类号】：P145.9

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