密度差 导航菜单编辑或修订编编辑或修订编

物理宇宙学


星系大尺度結構大霹靂宇宙密度密度重力星系大尺度結構




密度差（Density contrast）是一種解釋是星系和大尺度結構形成的理論，其方程式為:
Δ=∂ϱϱdisplaystyle Delta =frac partial varrho varrho

一般認為，宇宙是從一團熾熱微小的火球膨脹而成的，這就叫做大霹靂，而理論認為宇宙剛誕生時密度並非完全均勻的，其中有密度比較大和密度比較小的地方，而隨這宇宙的膨脹和冷卻，這些密度比較大的地方 會因為重力比較大而自行塌縮，這樣就會行成星系和大尺度結構。







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