暗物质和暗能量相互作用在宇宙微波背景辐射中的印记

发布时间：2018-07-11 16:43

本文选题：暗物质 + 暗能量　；参考：《复旦大学》2012年硕士论文

【摘要】：天文观测表明,我们的宇宙正在加速膨胀,为了对此做出解释,人们猜测宇宙中存在着一种未知的物质,称为“暗能量”。暗能量与暗物质一起,占据现今宇宙中物质总量的大部分。理论上,暗能量可能与暗物质相互作用。本文讨论暗能量和暗物质之间的两种耦合形式。首先,我们将原有的暗能量与暗物质问能量交换的模型,推广到暗能量状态方程随时间改变的情况；其次,类比Thomson散射,我们构造了暗物质受到暗能量散射的模型。对这两种模型,我们分别分析了它们的扰动稳定性问题,讨论这两种相互作用对宇宙微波背景辐射温度谱的影响,以及相互作用强度、暗能量状态方程和物质丰度等宇宙学参数间的简并,最后,我们使用天文观测数据对模型进行拟合,以打破参数间的简并,给出暗能量暗物质间相互作用的约束。
[Abstract]:Astronomical observations indicate that our universe is expanding at an accelerated pace, and to explain this, it is assumed that there is an unknown substance in the universe, called "dark energy". Dark energy, together with dark matter, accounts for most of all matter in the universe today. Theoretically, dark energy may interact with dark matter. Two kinds of coupling forms between dark energy and dark matter are discussed in this paper. First, we extend the original model of energy exchange between dark energy and dark matter to the case of dark energy equation of state changing with time; secondly, we construct a model of dark matter scattering by dark energy by analogy with Thomson scattering. For these two models, we analyze their perturbation stability, discuss the influence of these two interactions on the temperature spectrum of cosmic microwave background radiation and the intensity of the interaction. The degeneracy between the dark energy equation of state and the cosmological parameters such as mass abundance. Finally, we use the astronomical observation data to fit the model in order to break the degeneracy of the parameters and give the constraint of the interaction between dark energy and dark matter.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P159

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