星系际物质的湍流效应
发布时间：2018-12-11 14:27
【摘要】：正本文通过ΛCDM宇宙数值模拟,对星系际物质(IGM)中的湍流运动进行了研究,分析了其对重子物质成团的影响,并且探讨了利用相关观测方法来验证IGM湍流的可能性.在第1章中,首先对现代宇宙学的基础理论进行了简单回顾,主要描述膨胀宇宙的尺度因子的动力学方程—弗里德曼方程,以及宇宙中结构形成的理论和模型.随后介绍了应用广泛的宇宙学数值模拟方法,并且概括说明了本文将使用的WIGEON程序.对普通流体力学中的湍流作简要解释后,第2章主要利用数值模拟分析了模拟样本中IGM速度场的涡量.结果表明,低红移时星系际物质中的激波等复杂结构能有效激发涡量.涡量随时间迅速增
[Abstract]:In this paper, the turbulent motion in intergalactic matter (IGM) is studied by a numerical simulation of the CDM universe. The effect of the turbulence on the formation of baryon matter is analyzed, and the possibility of verifying the turbulence of IGM by using the relevant observational method is discussed. In chapter 1, the basic theory of modern cosmology is reviewed briefly, mainly describing the dynamic equation of scale factor of the expanding universe, Friedman equation, and the theory and model of the formation of structure in the universe. Then the cosmological numerical simulation method is introduced and the WIGEON program which will be used in this paper is summarized. After a brief explanation of turbulence in general hydrodynamics, the vorticity of IGM velocity field in simulated samples is analyzed by numerical simulation in Chapter 2. The results show that complex structures such as shock waves in intergalactic matter with low redshift can effectively excite vorticity. Vorticity increases rapidly with time
【作者单位】： 中国科学院紫金山天文台;
【分类号】：P152
，
本文编号：2372716
[Abstract]:In this paper, the turbulent motion in intergalactic matter (IGM) is studied by a numerical simulation of the CDM universe. The effect of the turbulence on the formation of baryon matter is analyzed, and the possibility of verifying the turbulence of IGM by using the relevant observational method is discussed. In chapter 1, the basic theory of modern cosmology is reviewed briefly, mainly describing the dynamic equation of scale factor of the expanding universe, Friedman equation, and the theory and model of the formation of structure in the universe. Then the cosmological numerical simulation method is introduced and the WIGEON program which will be used in this paper is summarized. After a brief explanation of turbulence in general hydrodynamics, the vorticity of IGM velocity field in simulated samples is analyzed by numerical simulation in Chapter 2. The results show that complex structures such as shock waves in intergalactic matter with low redshift can effectively excite vorticity. Vorticity increases rapidly with time
【作者单位】： 中国科学院紫金山天文台;
【分类号】：P152
，
本文编号：2372716
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