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Theoretical accuracy in cosmological growth estimation
Bose, Benjamin1; Koyama, Kazuya1; Hellwing, Wojciech A.1,2; Zhao, Gong-Bo1,3; Winther, Hans A.1
2017-07-18
发表期刊PHYSICAL REVIEW D
卷号96期号:2
摘要We elucidate the importance of the consistent treatment of gravity-model specific nonlinearities when estimating the growth of cosmological structures from redshift space distortions (RSD). Within the context of standard perturbation theory (SPT), we compare the predictions of two theoretical templates with redshift space data from COLA (comoving Lagrangian acceleration) simulations in the normal branch of DGP gravity (nDGP) and general relativity (GR). Using COLA for these comparisons is validated using a suite of full N-body simulations for the same theories. The two theoretical templates correspond to the standard general relativistic perturbation equations and those same equations modeled within nDGP. Gravitational clustering nonlinear effects are accounted for by modeling the power spectrum up to one-loop order and redshift space clustering anisotropy is modeled using the Taruya, Nishimichi and Saito (TNS) RSD model. Using this approach, we attempt to recover the simulation's fiducial logarithmic growth parameter f. By assigning the simulation data with errors representing an idealized survey with a volume of 10 Gpc(3)/ h(3), we find the GR template is unable to recover fiducial f to within 1 sigma at z = 1 when we match the data up to k(max) = 0.195h/Mpc. On the other hand, the DGP template recovers the fiducial value within 1s. Further, we conduct the same analysis for sets of mock data generated for generalized models of modified gravity using SPT, where again we analyze the GR template's ability to recover the fiducial value. We find that for models with enhanced gravitational nonlinearity, the theoretical bias of the GR template becomes significant for stage IV surveys. Thus, we show that for the future large data volume galaxy surveys, the self-consistent modeling of non-GR gravity scenarios will be crucial in constraining theory parameters.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
资助者University of Portsmouth ; University of Portsmouth ; European Research Council(646702) ; European Research Council(646702) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; Polish National Science Center(UMO-2012/07/D/ST9/02785) ; Polish National Science Center(UMO-2012/07/D/ST9/02785) ; University of Portsmouth ; University of Portsmouth ; European Research Council(646702) ; European Research Council(646702) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; Polish National Science Center(UMO-2012/07/D/ST9/02785) ; Polish National Science Center(UMO-2012/07/D/ST9/02785)
DOI10.1103/PhysRevD.96.023519
关键词[WOS]MATTER POWER SPECTRUM ; REDSHIFT-SPACE DISTORTIONS ; LARGE-SCALE STRUCTURE ; CLUSTERING WEDGES ; MODIFIED GRAVITY ; F(R) GRAVITY ; PERTURBATION-THEORY ; CONSTANT PROBLEM ; FULL SHAPE ; REAL-SPACE
收录类别SCI
语种英语
资助者University of Portsmouth ; University of Portsmouth ; European Research Council(646702) ; European Research Council(646702) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; Polish National Science Center(UMO-2012/07/D/ST9/02785) ; Polish National Science Center(UMO-2012/07/D/ST9/02785) ; University of Portsmouth ; University of Portsmouth ; European Research Council(646702) ; European Research Council(646702) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; UK Science and Technologies Facilities Council(ST/N000668/1) ; Polish National Science Center(UMO-2012/07/D/ST9/02785) ; Polish National Science Center(UMO-2012/07/D/ST9/02785)
WOS研究方向Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000405712900002
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8871
专题星系宇宙学研究部
作者单位1.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England
2.Univ Zielona Gora, Janusz Gil Inst Astron, Ul Szafrana 2, PL-65516 Zielona Gora, Poland
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Bose, Benjamin,Koyama, Kazuya,Hellwing, Wojciech A.,et al. Theoretical accuracy in cosmological growth estimation[J]. PHYSICAL REVIEW D,2017,96(2).
APA Bose, Benjamin,Koyama, Kazuya,Hellwing, Wojciech A.,Zhao, Gong-Bo,&Winther, Hans A..(2017).Theoretical accuracy in cosmological growth estimation.PHYSICAL REVIEW D,96(2).
MLA Bose, Benjamin,et al."Theoretical accuracy in cosmological growth estimation".PHYSICAL REVIEW D 96.2(2017).
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