Cosmic web and environmental dependence of screening: Vainshtein vs. chameleon
文献类型：期刊论文
| 作者 | Falck, Bridget1; Koyama, Kazuya1; Zhao, Gong-Bo1,2
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| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2015-07-01 |
| 期号 | 7 |
| 关键词 | modified gravity cosmological simulations cosmic web |
| 英文摘要 | Theories which modify general relativity to explain the accelerated expansion of the Universe often use screening mechanisms to satisfy constraints on Solar System scales. We investigate the effects of the cosmic web and the local environmental density of dark matter halos on the screening properties of the Vainshtein and chameleon screening mechanisms. We compare the cosmic web morphology of dark matter particles, mass functions of dark matter halos, mass and radial dependence of screening, velocity dispersions and peculiar velocities, and environmental dependence of screening mechanisms in f (R) and nDGP models. Using the ORIGAMI cosmic web identification routine we find that the Vainshtein mechanism depends on the cosmic web morphology of dark matter particles, since these are defined according to the dimensionality of their collapse, while the chameleon mechanism shows no morphology dependence. The chameleon screening of halos and their velocity dispersions depend on halo mass, and small halos and subhalos can be environmentally screened in the chameleon mechanism. On the other hand, the screening of halos in the Vainshtein mechanism does not depend on mass nor environment, and their velocity dispersions are suppressed. The peculiar velocities of halos in the Vainshtein mechanism are enhanced because screened objects can still feel the fifth force generated by external fields, while peculiar velocities of chameleon halos are suppressed when the halo centers are screened. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000359259500049 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5632]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth, Hants, England 2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Falck, Bridget,Koyama, Kazuya,Zhao, Gong-Bo. Cosmic web and environmental dependence of screening: Vainshtein vs. chameleon[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2015(7). |
| APA | Falck, Bridget,Koyama, Kazuya,&Zhao, Gong-Bo.(2015).Cosmic web and environmental dependence of screening: Vainshtein vs. chameleon.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(7). |
| MLA | Falck, Bridget,et al."Cosmic web and environmental dependence of screening: Vainshtein vs. chameleon".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .7(2015). |
入库方式： OAI收割
来源：国家天文台
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