Systematic simulations of modified gravity: chameleon models
文献类型：期刊论文
| 作者 | Brax, Philippe1; Davis, Anne-Christine2; Li, Baojiu3; Winther, Hans A.4; Zhao, Gong-Bo5,6
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| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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| 出版日期 | 2013-04-01 |
| 期号 | 4 |
| 关键词 | modified gravity power spectrum cosmological simulations particle physics - cosmology connection |
| 英文摘要 | In this work we systematically study the linear and nonlinear structure formation in chameleon theories of modified gravity, using a generic parameterisation which describes a large class of models using only 4 parameters. For this we have modified the N-body simulation code ECOSMOG to perform a total of 65 simulations for different models and parameter values, including the default Lambda CDM. These simulations enable us to explore a significant portion of the parameter space. We have studied the effects of modified gravity on the matter power spectrum and mass function, and found a rich and interesting phenomenology where the difference with the Lambda CDM paradigm cannot be reproduced by a linear analysis even on scales as large as k similar to 0.05 hMpc(-1), since the latter incorrectly assumes that the modification of gravity depends only on the background matter density. Our results show that the chameleon screening mechanism is significantly more efficient than other mechanisms such as the dilaton and symmetron, especially in high-density regions and at early times, and can serve as a guidance to determine the parts of the chameleon parameter space which are cosmologically interesting and thus merit further studies in the future. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000318556200029 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5995]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.CEA, CNRS, Inst Phys Theor, IPhT,URA 2306, F-91191 Gif Sur Yvette, France 2.Univ Cambridge, Ctr Math Sci, DAMTP, Cambridge CB3 0WA, England 3.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England 4.Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway 5.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Brax, Philippe,Davis, Anne-Christine,Li, Baojiu,et al. Systematic simulations of modified gravity: chameleon models[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013(4). |
| APA | Brax, Philippe,Davis, Anne-Christine,Li, Baojiu,Winther, Hans A.,&Zhao, Gong-Bo.(2013).Systematic simulations of modified gravity: chameleon models.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(4). |
| MLA | Brax, Philippe,et al."Systematic simulations of modified gravity: chameleon models".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .4(2013). |
入库方式： OAI收割
来源：国家天文台
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