C126 ガウス的初期条件における宇宙論的密度ゆらぎの確率分布関数
書誌事項
- タイトル別名
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- Probability Distribution Function of Cosmological Density Fluctuations from Gaussian Initial Condition
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説明
We quantitatively study the probability distribution function (PDF) of cosmological nonlinear density fluctuations from N-body simulations with Gaussian initial condition. With a particular attention to the validity and limitations of empirical log-normal PDF model against the PDF directly estimated from the simulations, we find that the log-normal PDF describes very accurately the cosmological density distribution even in the nonlinear regime (the rms variance σ_<nl>≲4 and the over-density δ≲100). Thus the log-normal PDF can be used as a useful empirical model for the cosmological density fluctuations. On the contrary, the one-to-one mapping of the initial and the evolved density fields consistent with the log-normal model does not approximate the broad distribution of their mutual correlation even on average.
収録刊行物
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- 日本流体力学会年会講演論文集
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日本流体力学会年会講演論文集 2001 95-96, 2001-07-31
日本流体力学会
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詳細情報 詳細情報について
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- CRID
- 1543950420075809792
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- NII論文ID
- 110003886903
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- NII書誌ID
- AA11567941
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- 本文言語コード
- ja
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- データソース種別
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- NDLデジコレ（旧NII-ELS）
- CiNii Articles