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Rejuvenating the matter power spectrum: restoring information with a logarithmic density mapping

ColdThunder 添加于 2010-7-21 13:21 | 1664 次阅读 | 0 个评论

作者
Neyrinck MC, Szapudi I, Szalay AS
摘要
We find that nonlinearities in the dark-matter power spectrum are dramatically smaller if the density field first undergoes a logarithmic mapping. In the Millennium simulation, this procedure produces a power spectrum with a shape hardly departing from the linear power spectrum for k <~ 1 h/Mpc at all redshifts. Also, this procedure unveils pristine Fisher information on a range of scales reaching a factor of 2-3 smaller than in the standard power spectrum, yielding 10 times more cumulative signal-to-noise at z=0.
详细资料
- 关键词: astro-ph.CO
- 文献种类: Journal Article
- 期刊缩写: Astrophys. J. Let.
- 期卷页: 2009年第698卷 L90-L93页
- 地址: Neyrinck: JHU; Szapudi: IfA Hawaii, Eötvös U.; Szalay: JHU
- 备注:arXiv:0903.4693v2; 4 pages, 5 figures, accepted to ApJ Letters. Minor changes to match accepted version. Illustrative large-scale-structure sonifications at http://skysrv.pha.jhu.edu/~neyrinck/sonifylss.html; Journal Ref: Astrophys. J. Let. 698 (2009) L90
学科领域自然科学 » 天文学
标签

lognormal power spectrum
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