本文選題：暗物質(zhì)　切入點：Agegraphic暗能量　出處：《遼寧師范大學(xué)》2010年碩士論文

【摘要】： 近年來,人們對Ia型超新星、宇宙微波背景以及大尺度結(jié)構(gòu)的觀測和研究都表明了這樣一個事實:我們的宇宙目前正在加速膨脹。解釋宇宙的加速膨脹也成為近期的熱門問題之一。人們已經(jīng)提出多種理論來解釋這一事實,其中最好的還屬暗能量理論。這一理論認(rèn)為宇宙中存在一種壓強(qiáng)為負(fù)的奇異“物質(zhì)”,它提供了排斥作用以抵消引力效應(yīng),因此驅(qū)動宇宙加速膨脹,這就是暗能量�，F(xiàn)有的暗能量模型有很多種,它們都是解釋宇宙加速膨脹的候選者,也都有各自的優(yōu)勢或缺陷。 本文在非平直宇宙的背景下,對有相互作用的新Agegraphic暗能量模型進(jìn)行了更深入的研究。我們選取三種相互作用形式,分別給出該模型密度參數(shù)、態(tài)方程和減速參數(shù)的演化方程和圖像。通過比較,我們認(rèn)為取Γ= 3b~2Hρ_q時,該模型的各參數(shù)與觀測符合較好,其態(tài)方程也能夠穿越-1。之后,我們在這種相互作用形式下對該模型進(jìn)行了幾何診斷,即statefinder診斷和Om診斷,并將演化軌跡顯示在r - s、r - q、w_q' - w_q和Om平面中。通過分析我們發(fā)現(xiàn),常數(shù)n和b~2在新Agegraphic暗能量模型的演化過程中扮演了重要角色,它們直接影響宇宙學(xué)量的演化。此外,通過診斷圖像我們可以直觀地看出該模型在有相互作用和無相互作用情況下的差別,還可用Om診斷法找出新舊Agegraphic暗能量模型以及LCDM模型之間的不同之處。
[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.
【學(xué)位授予單位】：遼寧師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2010
【分類號】：P145.9

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