星系與黑洞背景下軸子暗物質分布的研究
發(fā)布時間:2019-06-15 00:39
【摘要】:摘要:天文觀測表明宇宙中存在暗物質,并且暗物質是宇宙的主要組成部分,它們對宇宙的結構形成具有重要的作用,暗物質是天體物理學和粒子物理學中的重要研究課題。目前,暗物質的具體構成還不十分清楚,因此人們對暗物質做了許多理論上的預測。軸子是暗物質的候選者之一,它可能是一種質量很小的玻色子,并且在早期宇宙中的QCD相變中產生。 本文以軸子作為研究對象。首先,研究了在軸子暗物質的影響下,星系中圍繞其中心的天體旋轉速度與其到星系中心的距離的關系,并且作出了速度與距離的關系圖,同時以Rubin的實際觀測結果作為對比。在第四章中分別考慮了四種情況;化學勢為零的時候,取角量子數(shù)l=0和l=1的情況;化學勢不為零的時候,也考慮了角量子數(shù)l=0和l=1的情況。結果表明化學勢為零的理論計算與實際觀測的結果定性符合,而化學勢不為零時,只有l(wèi)=1的理論計算與實際觀測結果定性符合。另外,本文對這些結果的物理意義進行了分析和討論。 本文還研究了幾種黑洞背景下軸子暗物質的分布規(guī)律。分別計算了2維帶電點物質黑洞和4維帶電黑洞中軸子的密度分布,還計算了4維弦黑洞中軸子的密度分布,并將計算結果進行了討論和分析。另外,本文還計算了de Sitter和反de Sitter時空中的軸子密度分布和關聯(lián)函數(shù),討論了化學勢和宇宙常數(shù)對關聯(lián)效應的影響。 本文具有創(chuàng)新性的工作如下: 1、分析了具有化學勢的軸子暗物質對星系旋轉曲線的影響。 2、本文首次推導了彎曲時空下的Popov凝聚方程,分別計算了2維點物質黑洞、4維帶電黑洞以及4維dilaton黑洞背景下軸子的密度分布,對這些密度分布的規(guī)律進行了討論和分析。 3、本文首次計算了3維和4維de Sitter和反de Sitter時空中的軸子密度分布,并且計算了漸近情況下的軸子關聯(lián)函數(shù)。
[Abstract]:Abstract: astronomical observations show that dark matter exists in the universe, and dark matter is the main part of the universe, which plays an important role in the formation of the structure of the universe. Dark matter is an important research topic in astrophysics and particle physics. At present, the specific composition of dark matter is not very clear, so people have made a lot of theoretical predictions of dark matter. Axon is one of the candidates for dark matter. It may be a small mass boson and produced in the QCD phase transition in the early universe. In this paper, the axon is taken as the research object. Firstly, the relationship between the rotation velocity of celestial bodies around its center and the distance from the center of the galaxy to the center of the galaxy is studied under the influence of axon dark matter, and the relationship between velocity and distance is drawn. At the same time, the actual observation results of Rubin are compared. In chapter 4, four cases are considered respectively: when the chemical potential is zero, the angular quantum numbers l 鈮,
本文編號:2499833
[Abstract]:Abstract: astronomical observations show that dark matter exists in the universe, and dark matter is the main part of the universe, which plays an important role in the formation of the structure of the universe. Dark matter is an important research topic in astrophysics and particle physics. At present, the specific composition of dark matter is not very clear, so people have made a lot of theoretical predictions of dark matter. Axon is one of the candidates for dark matter. It may be a small mass boson and produced in the QCD phase transition in the early universe. In this paper, the axon is taken as the research object. Firstly, the relationship between the rotation velocity of celestial bodies around its center and the distance from the center of the galaxy to the center of the galaxy is studied under the influence of axon dark matter, and the relationship between velocity and distance is drawn. At the same time, the actual observation results of Rubin are compared. In chapter 4, four cases are considered respectively: when the chemical potential is zero, the angular quantum numbers l 鈮,
本文編號:2499833
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