發(fā)布時間：2018-06-13 11:49

  本文選題：宇宙加速膨脹 + agegraphic暗能量��； 參考：《東北大學(xué)》2010年碩士論文

【摘要】：自從1998年兩個超新星觀測團(tuán)隊分別獨立地發(fā)現(xiàn)今天的宇宙正在加速膨脹以來,暗能量問題就成為了物理學(xué)和天文學(xué)研究中最為重要的問題之一。在引言中,概述了暗能量的研究背景及暗能量問題的研究現(xiàn)狀。第二章中,從宇宙動力學(xué)談起,介紹了對宇宙加速膨脹的幾種詮釋,其中包括宇宙學(xué)常數(shù)模型、動力學(xué)標(biāo)量場暗能量模型(包括精質(zhì)、幽靈和精靈模型)、全息暗能量模型及修正的引力理論。第三章中,主要研究Brans-Dicke理論框架下的新agegraphic暗能量模型。Agegraphic暗能量模型是結(jié)合量子力學(xué)中的海森堡不確定性原理和廣義相對論中的引力效應(yīng)而提出的一種模型。在Brans-Dicke理論框架下,我們主要研究了新agegraphic暗能量模型的動力學(xué)演化行為,推導(dǎo)了新agegraphic暗能量的密度參量、狀態(tài)方程參量和宇宙減速因子的具體表達(dá)形式,發(fā)現(xiàn)agegraphic暗能量能實現(xiàn)類精靈行為,即狀態(tài)方程參量在演化過程中能穿越-1。對比了在Brans-Dicke理論和愛因斯坦理論框架下新agegraphic暗能量的演化行為,另外,探究了相互作用的新agegraphic暗能量模型的演化行為。除此之外,還應(yīng)用弱引力猜測的結(jié)果,即精質(zhì)標(biāo)量場φ的變化量的絕對值小于等于普朗克質(zhì)量Mp,對agegraphic精質(zhì)模型中的參量n進(jìn)行了可能的理論限制,得出的模型參量n的理論上限為n≤2.5,這與當(dāng)前的觀測限制結(jié)果2.637n2.983(95.4%置信度)不一致。最后討論了產(chǎn)生這種理論限制結(jié)果與當(dāng)前的觀測限制結(jié)果的顯著差異的可能原因。
[Abstract]:Since 1998, when two supernova observation teams independently discovered that today's universe is expanding rapidly, dark energy has become one of the most important problems in physics and astronomy. In the introduction, the background of dark energy and the research status of dark energy are summarized. In the second chapter, we introduce several interpretations of the accelerating expansion of the universe, including the cosmological constant model, the kinetic scalar field dark energy model (including fine matter). Ghost and Elf models, holographic dark energy models and modified gravitational theory. In the third chapter, the new agegraphic dark energy model. The age graphic dark energy model under the Brans-Dicke theory is a model proposed combining the Heisenberg uncertainty principle in quantum mechanics and the gravitational effect in general relativity. In the frame of Brans-Dicke 's theory, we mainly study the dynamic evolution of the new agegraphic dark energy model, and derive the density parameter, state equation parameter and cosmic deceleration factor of the new agegraphic dark energy. It is found that the agegraphic dark energy can realize the elf-like behavior, that is, the state equation parameters can traverse -1 in the evolution process. The evolution behavior of the new agegraphic dark energy under the framework of Brans-Dicke theory and Einstein theory is compared. In addition, the evolution behavior of the new agegraphic dark energy model is explored. In addition, by using the result of weak gravity guess, that is, the absolute value of the variation of the fine scalar field 蠁 is less than or equal to the Planck mass MP, the parameter n in the agegraphic seminal model is theoretically restricted. The theoretical upper limit of the model parameter n is n 鈮，

本文編號：2013926