The nonlinear evolution of the bispectrum in scale-free N-body simulations
文献类型：期刊论文
| 作者 | Hou, YH; Jing, YP; Zhao, DH; Borner, G |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2005-02-01 |
| 卷号 | 619期号:2页码:667-677 |
| 关键词 | cosmology : theory galaxies : clusters : general large-scale structure of universe methods : N-body simulations |
| 英文摘要 | We have accurately measured the bispectrum for four scale-free models of structure formation with spectral indices of n = 1, 0, - 1, and - 2. The measurements are based on a new method that can effectively eliminate alias and numerical artifacts and reliably extend the analysis into the strongly nonlinear regime. This work makes use of a set of state-of-the-art N-body simulations that have significantly increased the resolution range compared with previous studies on the subject. With these measured results, we demonstrate that the measured bispectrum depends on the shape and size of the k-triangle even in the strongly nonlinear regime. It increases with wavenumber and decreases with the spectral index. These results are in contrast with the hypothesis that the reduced bispectrum is a constant in the strongly nonlinear regime. We also show that the fitting formula of Scoccimarro and Frieman does not describe our simulation results well ( with a typical error of about 40%). In the end, we present a new fitting formula for the reduced bispectrum that is valid for - 2 less than or equal to n less than or equal to 0, with a typical error of only 10%. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | 3-POINT CORRELATION-FUNCTION ; COSMOLOGICAL PERTURBATION-THEORY ; GALAXY REDSHIFT SURVEY ; DARK-MATTER ; GRAVITATIONAL-INSTABILITY ; NUMERICAL SIMULATIONS ; LAGRANGIAN APPROACH ; SELF-SIMILARITY ; FITTING FORMULA ; DENSITY FIELDS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000226589100002 |
| 源URL | [http://119.78.226.72/handle/331011/19374]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Max Planck Inst Astrophys, Partner Grp, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Max Planck Inst Astrophys, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Hou, YH,Jing, YP,Zhao, DH,et al. The nonlinear evolution of the bispectrum in scale-free N-body simulations[J]. ASTROPHYSICAL JOURNAL,2005,619(2):667-677. |
| APA | Hou, YH,Jing, YP,Zhao, DH,&Borner, G.(2005).The nonlinear evolution of the bispectrum in scale-free N-body simulations.ASTROPHYSICAL JOURNAL,619(2),667-677. |
| MLA | Hou, YH,et al."The nonlinear evolution of the bispectrum in scale-free N-body simulations".ASTROPHYSICAL JOURNAL 619.2(2005):667-677. |
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来源：上海天文台
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