本文選題：粘滯效應(yīng)　切入點：非平直宇宙　出處：《遼寧師范大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：當(dāng)前,人類已經(jīng)進入了精確宇宙學(xué)時代。近些年來,通過對Ia型超新星的觀測,以及對宇宙微波背景輻射和大尺度結(jié)構(gòu)的精確數(shù)據(jù)分析表明宇宙正在加速膨脹。宇宙加速膨脹的發(fā)現(xiàn),對現(xiàn)代物理理論提出了新的挑戰(zhàn),也對科學(xué)計算賦予了新的任務(wù)。如何解釋宇宙的加速膨脹已成為目前的熱門問題之一。人們已經(jīng)提出許多理論和宇宙學(xué)模型來解釋這一事實。因此,本文的主要工作是利用解析方法和數(shù)值分析研究了Cardassian宇宙學(xué)模型,即非平直宇宙中含有粘滯效應(yīng)的Cardassian冪律模型。 本文首先介紹了現(xiàn)代宇宙學(xué)的背景知識,包括基本理論、標準宇宙學(xué)模型以及甚早期宇宙的暴脹模型。此后,研究了粘滯效應(yīng)對宇宙演化的影響,介紹了粘滯效應(yīng)。它可以作為解釋宇宙學(xué)疑難的候選者。因此,可以將其應(yīng)用到現(xiàn)代宇宙學(xué)領(lǐng)域。我們主要將其應(yīng)用在非平直宇宙中的Cardassian冪律模型中。在非平直宇宙的背景下,本文對含有粘滯效應(yīng)的Cardassian冪律模型進行了更深入地研究,給出了該模型相關(guān)的宇宙學(xué)參數(shù)演化方程。從粘滯效應(yīng)影響下的密度參數(shù)和態(tài)方程中,我們可以看出本文的討論不失一般性。之后,本文對該模型進行了幾何診斷,即Statefinder診斷,并描繪了r-s曲線的演化。通過分析我們發(fā)現(xiàn),粘滯效應(yīng)對Cardassian冪律模型的演化起到了重要作用,直接影響著宇宙的演化。
[Abstract]:At present, mankind has entered the era of precise cosmology. In recent years, through the observation of type Ia supernova, As well as accurate data analysis of microwave background radiation and large scale structure of the universe shows that the universe is accelerating expansion. The discovery of the accelerating expansion of the universe poses a new challenge to modern physical theory. New tasks have also been assigned to scientific computation. How to explain the accelerating expansion of the universe has become one of the hot issues. Many theories and cosmological models have been proposed to explain this fact. The main work of this paper is to study the Cardassian cosmological model by means of analytical method and numerical analysis, that is, the Cardassian power law model with viscous effect in the non-straight universe. This paper first introduces the background knowledge of modern cosmology, including basic theory, standard cosmological model and inflation model of the very early universe. Then, the influence of viscous effect on the evolution of the universe is studied. The viscous effect is introduced. It can be used as a candidate for explaining the difficult problems of cosmology. Therefore, it can be applied to the field of modern cosmology. We mainly apply it to the Cardassian power law model in the non-straight universe. In this paper, the Cardassian power law model with viscous effect is studied in depth, and the evolution equations of cosmological parameters are given. We can see that the discussion in this paper is not out of the ordinary. After that, the geometric diagnosis of the model, that is, the Statefinder diagnosis, and the evolution of the r-s curve are described. The viscous effect plays an important role in the evolution of the Cardassian power law model and directly affects the evolution of the universe.
【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】：2013
【分類號】：P159

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本文編號：1634167