热门
Observational tests of modified gravity
文献类型：期刊论文
| 作者 | Jain, Bhuvnesh1; Zhang, Pengjie2,3 |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2008-09-01 |
| 卷号 | 78期号:6页码:1 |
| 英文摘要 | Modifications of general relativity provide an alternative explanation to dark energy for the observed acceleration of the Universe. Modified gravity theories have richer observational consequences for large-scale structures than conventional dark energy models, in that different observables are not described by a single growth factor even in the linear regime. We examine the relationships between perturbations in the metric potentials, density and velocity fields, and discuss strategies for measuring them using gravitational lensing, galaxy cluster abundances, galaxy clustering/dynamics, and the integrated Sachs-Wolfe effect. We show how a broad class of gravity theories can be tested by combining these probes. A robust way to interpret observations is by constraining two key functions: the ratio of the two metric potentials, and the ratio of the gravitational "constant" in the Poisson equation to Newton's constant. We also discuss quasilinear effects that carry signatures of gravity, such as through induced three-point correlations. Clustering of dark energy can mimic features of modified gravity theories and thus confuse the search for distinct signatures of such theories. It can produce pressure perturbations and anisotropic stresses, which break the equality between the two metric potentials even in general relativity. With these two extra degrees of freedom, can a clustered dark energy model mimic modified gravity models in all observational tests? We show with specific examples that observational constraints on both the metric potentials and density perturbations can in principle distinguish modifications of gravity from dark energy models. We compare our result with other recent studies that have slightly different assumptions (and apparently contradictory conclusions). |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 研究领域[WOS] | Astronomy & Astrophysics ; Physics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; LARGE-SCALE STRUCTURE ; COSMOLOGICAL PERTURBATION-THEORY ; 3-DIMENSIONAL POWER SPECTRUM ; PAIRWISE VELOCITY DISPERSION ; DARK-MATTER MODELS ; BULK FLOWS ; PECULIAR VELOCITIES ; REDSHIFT SURVEY ; ANALYTIC MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000259692800027 |
| 源URL | [http://119.78.226.72/handle/331011/19537]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA 2.Shanghai Astron Observ, JOINGC, Shanghai 200030, Peoples R China 3.Univ Sci & Technol China, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jain, Bhuvnesh,Zhang, Pengjie. Observational tests of modified gravity[J]. PHYSICAL REVIEW D,2008,78(6):1. |
| APA | Jain, Bhuvnesh,&Zhang, Pengjie.(2008).Observational tests of modified gravity.PHYSICAL REVIEW D,78(6),1. |
| MLA | Jain, Bhuvnesh,et al."Observational tests of modified gravity".PHYSICAL REVIEW D 78.6(2008):1. |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。