【摘要】：精確的天文觀測數(shù)據(jù)表明當(dāng)前的宇宙正處于加速膨脹狀態(tài),近年來解釋宇宙加速膨脹的暗能量已經(jīng)成為宇宙學(xué)研究的熱點(diǎn)問題。然而對暗能量的本質(zhì)我們卻所知甚少。要想揭示它的性質(zhì),我們必須依賴于天文觀測數(shù)據(jù)。強(qiáng)引力透鏡是天體物理和宇宙學(xué)研究中最重要的工具和手段之一,已經(jīng)被廣泛的應(yīng)用。 本文基于強(qiáng)引力透鏡的觀測數(shù)據(jù)對宇宙學(xué)暗能量模型進(jìn)行限制。具體來說,本論文分為三章來闡述。第一章是強(qiáng)引力透鏡基礎(chǔ)知識(shí)；第二章是介紹暗能量宇宙學(xué)模型；第三章,考慮到透鏡星系質(zhì)量分布理論模型的速度彌散與可觀測的恒星速度彌散不同,二者關(guān)系與一自由參數(shù)fE有關(guān),這一自由參數(shù)的存在會(huì)對數(shù)據(jù)擬合產(chǎn)生影響。為了排除自由參數(shù)對數(shù)值模擬的影響,我們提出了用角直徑距離比Dijobs=θEiσ0j2/θEjσ0i2為觀測數(shù)據(jù),采用蒙特卡羅方法對宇宙學(xué)模型進(jìn)行限制。這里愛因斯坦半徑θEi和恒星的速度彌散σoi可以直接從天文觀測得到有關(guān)數(shù)據(jù)。文章的最后給出強(qiáng)引力透鏡在天文觀測中的展望。
[Abstract]:Accurate astronomical observations show that the universe is in a state of accelerating expansion. In recent years, explaining the dark energy of the accelerating expansion of the universe has become a hot issue in cosmology. But we know little about the nature of dark energy. To reveal its nature, we must rely on astronomical observations. As one of the most important tools and means in astrophysics and cosmology, strong gravitational lensing has been widely used. In this paper, the cosmological dark energy model is limited based on the observational data of strong gravitational lensing. Specifically, this paper is divided into three chapters to elaborate. The first chapter is the basic knowledge of strong gravitational lensing, the second chapter is the introduction of dark energy cosmology model. In chapter 3, considering that the velocity dispersion of the theoretical model of lens-galactic mass distribution is different from that of observable stellar velocity dispersion, the relationship between them is related to a free parameter fE, and the existence of this free parameter will have an effect on the data fitting. In order to exclude the influence of free parameters on the numerical simulation, we propose to use Dijobs= 胃 Ei 蟽 0j2/ 胃 Ej 蟽 0i2 as observation data, and use Monte Carlo method to limit the cosmological model. Here the Einstein radius 胃 Ei and the velocity dispersion 蟽 oi of the star can be obtained directly from astronomical observations. Finally, the prospect of strong gravitational lensing in astronomical observation is given.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P159

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前2條

1 張敬飛;暗能量宇宙學(xué)若干問題的研究[D];大連理工大學(xué);2009年

2 呂劍波;天文觀測限制暗能量理論模型的研究[D];大連理工大學(xué);2010年

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本文編號(hào)：2416224