Mass functions from the excursion set model
文献类型：期刊论文
| 作者 | Hiotelis, Nicos1; Del Popolo, Antonino2,3,4 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2017-11-10 |
| 卷号 | 607页码:6 |
| ISSN号 | 1432-0746 |
| 关键词 | cosmology: theory dark matter |
| DOI | 10.1051/0004-6361/201731467 |
| 英文摘要 | Aims. We aim to study the stochastic evolution of the smoothed overdensity delta at scale S of the form delta(S) = integral(S)(0) K(S,u)dW(u), where K is a kernel and dW is the usual Wiener process. Methods. For a Gaussian density field, smoothed by the top-hat filter, in real space, we used a simple kernel that gives the correct correlation between scales. A Monte Carlo procedure was used to construct random walks and to calculate first crossing distributions and consequently mass functions for a constant barrier. Results. We show that the evolution considered here improves the agreement with the results of N-body simulations relative to analytical approximations which have been proposed from the same problem by other authors. In fact, we show that an evolution which is fully consistent with the ideas of the excursion set model, describes accurately the mass function of dark matter haloes for values of nu <= 1 and underestimates the number of larger haloes. Finally, we show that a constant threshold of collapse, lower than it is usually used, it is able to produce a mass function which approximates the results of N-body simulations for a variety of redshifts and for a wide range of masses. Conclusions. A mass function in good agreement with N-body simulations can be obtained analytically using a lower than usual constant collapse threshold. |
| WOS关键词 | DARK-MATTER HALOES ; GAUSSIAN FLUCTUATIONS ; ELLIPSOIDAL COLLAPSE ; CLUSTERS ; EVOLUTION ; GALAXIES ; COSMOLOGY ; PERTURBATIONS ; UNIVERSALITY ; DEPENDENCE |
| 资助项目 | Chinese Academy of Sciences ; [2017 VMA0044] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:000415263000001 |
| 资助机构 | Chinese Academy of Sciences |
| 源URL | [http://119.78.100.186/handle/113462/46026]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Hiotelis, Nicos |
| 作者单位 | 1.1 Lyceum Athens, Ipitou 15, Athens 10557, Greece 2.Chinese Acad Sci, Inst Modern Phys, POB 31, Lanzhou 730000, Gansu, Peoples R China 3.Univ Catania, Dipartimento Fis & Astron, Viale Andrea Doria 6, I-95125 Catania, Italy 4.Ist Nazl Fis Nucl, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy |
| 推荐引用方式 GB/T 7714 | Hiotelis, Nicos,Del Popolo, Antonino. Mass functions from the excursion set model[J]. ASTRONOMY & ASTROPHYSICS,2017,607:6. |
| APA | Hiotelis, Nicos,&Del Popolo, Antonino.(2017).Mass functions from the excursion set model.ASTRONOMY & ASTROPHYSICS,607,6. |
| MLA | Hiotelis, Nicos,et al."Mass functions from the excursion set model".ASTRONOMY & ASTROPHYSICS 607(2017):6. |
入库方式： OAI收割
来源：近代物理研究所
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