TOPOLOGY OF A LARGE-SCALE STRUCTURE AS A TEST OF MODIFIED GRAVITY

	TOPOLOGY OF A LARGE-SCALE STRUCTURE AS A TEST OF MODIFIED GRAVITY
	Wang, Xin 1,2; Chen, Xuelei1,3 ; Park, Changbom 4
刊名	ASTROPHYSICAL JOURNAL
	2012-03-01
卷号	747 期号:1
关键词	large-scale structure of universe
英文摘要	The genus of the isodensity contours is a robust measure of the topology of a large-scale structure, and it is relatively insensitive to nonlinear gravitational evolution, galaxy bias, and redshift-space distortion. We show that the growth of density fluctuations is scale dependent even in the linear regime in some modified gravity theories, which opens a new possibility of testing the theories observationally. We propose to use the genus of the isodensity contours, an intrinsic measure of the topology of the large-scale structure, as a statistic to be used in such tests. In Einstein's general theory of relativity, density fluctuations grow at the same rate on all scales in the linear regime, and the genus per comoving volume is almost conserved as structures grow homologously, so we expect that the genus-smoothing-scale relation is basically time independent. However, in some modified gravity models where structures grow with different rates on different scales, the genus-smoothing-scale relation should change over time. This can be used to test the gravity models with large-scale structure observations. We study the cases of the f(R) theory, DGP braneworld theory as well as the parameterized post-Friedmann models. We also forecast how the modified gravity models can be constrained with optical/IR or redshifted 21 cm radio surveys in the near future.
收录类别	SCI
语种	英语
WOS记录号	WOS:000300627300048
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6269]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 4.Korea Inst Adv Study, Seoul 130722, South Korea
推荐引用方式 GB/T 7714	Wang, Xin,Chen, Xuelei,Park, Changbom. TOPOLOGY OF A LARGE-SCALE STRUCTURE AS A TEST OF MODIFIED GRAVITY[J]. ASTROPHYSICAL JOURNAL,2012,747(1).
APA	Wang, Xin,Chen, Xuelei,&Park, Changbom.(2012).TOPOLOGY OF A LARGE-SCALE STRUCTURE AS A TEST OF MODIFIED GRAVITY.ASTROPHYSICAL JOURNAL,747(1).
MLA	Wang, Xin,et al."TOPOLOGY OF A LARGE-SCALE STRUCTURE AS A TEST OF MODIFIED GRAVITY".ASTROPHYSICAL JOURNAL 747.1(2012).