Systematic simulations of modified gravity: symmetron and dilaton 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 | 2012-10-01 |
| 期号 | 10 |
| 关键词 | modified gravity cosmological simulations |
| 英文摘要 | We study the linear and nonlinear structure formation in the dilaton and symmetron models of modified gravity using a generic parameterisation which describes a large class of scenarios using only a few parameters, such as the coupling between the scalar field and the matter, and the range of the scalar force on very large scales. For this we have modified the N-body simulation code ECOSMOG, which is a variant of RAMSES working in modified gravity scenarios, to perform a set of 110 simulations for different models and parameter values, including the default Lambda CDM. These simulations enable us to explore a large 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 template cannot be reproduced by a linear analysis even on scales as large as k similar to 0.05 h Mpc(-1). Our results show the full effect of screening on nonlinear structure formation and the associated deviation from Lambda CDM. We also investigate how differences in the force mediated by the scalar field in modified gravity models lead to qualitatively different features for the nonlinear power spectrum and the halo mass function, and how varying the individual model parameters changes these observables. The differences are particularly large in the nonlinear power spectra whose shapes for f(R), dilaton and symmetron models vary greatly, and where the characteristic bump around 1 h Mpc(-1) of f (R) models is preserved for symmetrons, whereas an increase on much smaller scales is particular to symmetrons. No bump is present for dilatons where a flattening of the power spectrum takes place on small scales. These deviations from Lambda CDM and the differences between modified gravity models, such as dilatons and symmetrons, could be tested with future surveys. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000310793700003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6110]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.CEA, IPhT, CNRS, URA 2306,Inst Phys Theor, 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: symmetron and dilaton models[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(10). |
| APA | Brax, Philippe,Davis, Anne-Christine,Li, Baojiu,Winther, Hans A.,&Zhao, Gong-Bo.(2012).Systematic simulations of modified gravity: symmetron and dilaton models.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(10). |
| MLA | Brax, Philippe,et al."Systematic simulations of modified gravity: symmetron and dilaton models".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .10(2012). |
入库方式： OAI收割
来源：国家天文台
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