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题名: Scale transformations, tree-level perturbation theory and the cosmological matter bispectrum
作者: Pan, Jun1, 2; Coles, Peter2, 3; Szapudi, Istvan4
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2007-12-21
卷号: 382, 期号:4, 页码:1460-1464
关键词: cosmology : theory ; large-scale structure of universe
DOI: 10.1111/j.1365-2966.2007.12494.x
文章类型: Article
英文摘要: Scale transformations have played an extremely successful role in studies of cosmological large-scale structure by relating the non-linear spectrum of cosmological density fluctuations to the linear primordial power at longer wavelengths. Here, we generalize this approach to investigate the usefulness of scale transformations for non-linear higher order statistics, specifically the bispectrum. We find that the bispectrum predicted by perturbation theory at tree level can be rescaled to match the results of full numerical simulations in the weakly and intermediately non-linear regimes, especially at high redshifts, with an accuracy that is surprising given the simplicity of the procedure used. This discovery not only offers a simple practical way of calculating the matter bispectrum but also suggests that scale transformations may yet yield even deeper insights into the physics of hierarchical clustering.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: NONLINEAR EVOLUTION ; POWER SPECTRA ; HALO-MODEL ; SIMULATIONS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000251672100006
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15855
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England
3.Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, Wales
4.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
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