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Why is the Zel'dovich Approximation so Accurate? | | A. Yoshisato
; M. Morikawa
; N. Gouda
; H. Mouri
; | | Date: |
5 Oct 2005 | | Subject: | astro-ph | | Abstract: | Why does the Zel’dovich approximation (ZA) work well for a gravitational collapse in the universe? This problem is examined by focussing the dependence on the dimensionality of the collapse. The ZA is known to be exact for a one-dimensional collapse. We show that the ZA is more accurate in the order of three-, two-, and one-dimensional collapses. Furthermore, using models for spheroidal collapse, we show that the ZA remains accurate in any collapse, which becomes progressively lower-dimensional with the passage of time. That is, the ZA is accurate because the essence of the gravitational collapse is incorporated in the ZA. | | Source: | arXiv, astro-ph/0510107 | | Services: | Forum | Review | PDF | Favorites | |
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