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・ Denshin 8 go
・ Denshway Museum
・ Denshūtai
・ Densified coal
・ Densignathus
・ Densill Theobald
・ Densitation
・ Densities of the elements (data page)
・ Densitometer
・ Densitometry
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・ Density (disambiguation)
・ Density (polytope)
・ Density 21.5
・ Density altitude
Density contrast
・ Density Cup
・ Density dependence
・ Density estimation
・ Density functional theory
・ Density gradient
・ Density logging
・ Density matrix
・ Density matrix embedding theory
・ Density matrix renormalization group
・ Density meter
・ Density of air
・ Density of states
・ Density on a manifold
・ Density theorem


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Density contrast : ウィキペディア英語版
Density contrast

The Density Contrast is a parameter used in galaxy formation to indicate where there are local enhancements in matter density.
:\Delta=\frac
It is believed that after inflation, although the universe was mostly uniform, some regions were slightly denser than others with contrast densities on the order of 1 trillionth. As the horizon distance expanded, the enclosed causally connected (i.e. gravitationally connected) masses increased until they reached the Jeans mass and began to collapse, which allowed galaxies, galaxy clusters, superclusters, and filaments to form.



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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