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  • 學位論文

在塵埃宇宙中,不均勻性導致宇宙加速膨脹之探索

Inhomogeneity-Induced Cosmic Acceleration in a Dust Universe

指導教授 : 黃偉彥

摘要


一般認為,如果宇宙中只存在產生吸引力的物質或能量,那麼宇宙必然只會減速膨脹。為了檢驗這個概念,我們在一個用來描述球對稱的塵埃流體的精確解中(Lemaitre-Tolman-Bondi solution),找出了反例。因此,這個概念其實是令人懷疑的。對於宇宙的不均勻性,我們應該更深入的研究。這些例子,開啟一個新的角度去了解我們宇宙的演化。

關鍵字

不均勻 黑暗能量 加速膨脹

並列摘要


It is the common consensus that the expansion of a universe always slows down if the gravity provided by the energy sources therein is universally attractive. To examine this point we find counter-examples for the spherically symmetric dust fluid described by the Lemaitre-Tolman-Bondi solution. Thus, the validity of this naive consensus is indeed doubtful and the effects of inhomogeneities should be restudied. The example opens a new perspective for understanding the evolution of our universe.

參考文獻


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