本文關(guān)鍵詞：含粘性的統(tǒng)一暗流體模型與球狀塌縮　出處：《大連理工大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 體積粘性 統(tǒng)一暗流體模型 非絕熱擾動 觀測限制 球狀塌縮

【摘要】：近些年來,大量的天文觀測數(shù)據(jù)(如Ia型超新星,宇宙微波背景輻射以及物質(zhì)功率譜等等)強(qiáng)烈表明目前宇宙正經(jīng)歷著加速膨脹的過程,并且這種加速膨脹是由一種約占據(jù)宇宙總能量96%的未知暗流體所驅(qū)動。這種暗流體通常被分解為兩部分：暗物質(zhì)和暗能量。然而目前的引力探測水平并不能把這兩種成分有效地區(qū)分開來(這被稱為暗簡并問題),并且到目前為止沒有可靠的物理原理支持任何形式的分解。這激勵研究者們提出一些統(tǒng)一暗物質(zhì)和暗能量的理論模型來研究宇宙。這些統(tǒng)一的宇宙模型的共同特點(diǎn)是將充滿宇宙空間的介質(zhì)視作理想流體來對待,并且所研究的擾動都是絕熱的。隨著宇宙學(xué)觀測限制與理論模型之間出現(xiàn)矛盾,一些學(xué)者又提出應(yīng)該考慮宇宙介質(zhì)的非絕熱擾動。也就是說宇宙中的介質(zhì)有可能并非理想流體,而是含有粘性的非理想流體。這種含粘性的模型因為使非絕熱擾動成為其內(nèi)稟的屬性而備受青睞。本論文主要研究具有體積粘性的統(tǒng)一暗流體模型的宇宙學(xué)觀測限制工作以及體積粘性在宇宙大尺度結(jié)構(gòu)形成過程中所產(chǎn)生的影響。首先概述宇宙學(xué)的發(fā)展歷史、研究內(nèi)容及背景知識。然后介紹目前主要的天文觀測和幾種常見的宇宙學(xué)理論模型。本論文的主要研究工作在第三章、第四章及附錄部分。在第三章,研究一種具有體積粘性的統(tǒng)一GCG模型,我們首次考慮體積粘性的擾動情況。利用天文觀測數(shù)據(jù)對模型的參數(shù)空間進(jìn)行限制,得到新增模型參數(shù)—體積粘性系數(shù)ζ0在3σ范圍內(nèi)的取值,并且還討論了體積粘性對態(tài)方程參數(shù)和有效絕熱聲速的演化過程的影響。第四章,我們探討VGCG模型的球狀塌縮過程,分析討論體積粘性對宇宙大尺度結(jié)構(gòu)形成(即塌縮過程)的影響,并且將結(jié)果與ACDM模型的結(jié)果進(jìn)行比較。本文最后一章是總結(jié)和展望。此外,附錄部分介紹了宇宙學(xué)的擾動理論(包含體積粘性的擾動),并且給出了密度擾動和速度擾動方程的具體導(dǎo)出過程。
[Abstract]:In recent years, a large number of astronomical data (such as a type I supernova, the cosmic microwave background radiation and matter power spectra etc.) strongly suggest that the universe is undergoing the process of accelerated expansion, and the accelerated expansion is driven by a accounted for 96% of the total energy cosmic unknown dark fluid. This dark fluid is usually decomposed two part: dark matter and dark energy. However, the gravity probe level cannot separate the two components of effective area (this is called dark degeneracy problem), and so far no physical principle and reliable support for decomposition of any form. This incentive researchers put forward some uniform and dark matter the dark energy theory model to study the universe. A common feature of these unified model of the universe is full of space as the ideal fluid medium to treat, and the disturbance of are insulated. With the contradiction between the limitation of cosmological observations and theoretical model, some scholars suggest that the universe should consider non adiabatic medium disturbance. That is to say the universe may not be ideal fluid medium, but non ideal fluid containing a viscous. The viscous model for non adiabatic perturbation becomes the intrinsic attributes and more popular this paper mainly studies. The unified viscous fluid model of dark cosmological observations and limited volume viscosity formed by the impact of large scale structure in the universe. Firstly, cosmology's development history, research content and background knowledge. And then introduces the theory of cosmology model common astronomical observations and several major mainly. The research work of this thesis in the third chapter, the fourth chapter and the appendix. In the third chapter, a unified GCG model has the volume viscosity We first consider the disturbance type, volume viscosity. To limit the parameter space with the astronomical observation data of the model, get the new model parameters - volume viscosity coefficient in the range of 3 Sigma zeta 0 in value, and the influence of the evolution of the volume viscosity on the equation of state parameters and the effective adiabatic sound speed is discussed. In the fourth chapter. We investigate the VGCG model of the spherical collapse process, analysis and discussion of volume viscosity on the large scale structure of the universe formed (i.e. collapse) effect, and the results were compared with the results of the ACDM model. The last chapter is the summary and outlook. In addition, the appendix introduces the perturbation theory of Cosmology (including perturbation of volume viscosity the), and gives the specific derivation process density perturbations and velocity perturbation equations.

【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P159

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