【摘要】：正本文通過ΛCDM宇宙數(shù)值模擬,對星系際物質(zhì)(IGM)中的湍流運動進行了研究,分析了其對重子物質(zhì)成團的影響,并且探討了利用相關觀測方法來驗證IGM湍流的可能性.在第1章中,首先對現(xiàn)代宇宙學的基礎理論進行了簡單回顧,主要描述膨脹宇宙的尺度因子的動力學方程—弗里德曼方程,以及宇宙中結構形成的理論和模型.隨后介紹了應用廣泛的宇宙學數(shù)值模擬方法,并且概括說明了本文將使用的WIGEON程序.對普通流體力學中的湍流作簡要解釋后,第2章主要利用數(shù)值模擬分析了模擬樣本中IGM速度場的渦量.結果表明,低紅移時星系際物質(zhì)中的激波等復雜結構能有效激發(fā)渦量.渦量隨時間迅速增
[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
【作者單位】： 中國科學院紫金山天文臺;
【分類號】：P152
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本文編號：2372716