Testing General Relativity using the growth rate of structure

NEB 15 – Recent Developments in Gravity

Pouri, Athina^1 ; Basilakos, Spyros^2

Department of Physics, Section of Astronomy, Astrophysics and Mechanics, University of Athens, Panepistemiopolis, Athens 157 83, Greece^1

Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efessiou 4, 11-527, Athens, Greece^2

关键词: Deep survey;    General Relativity;    Gravity model;    Growth data;    Growth history;    Growth indexes;    Likelihood analysis;    Stringent constraints;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/453/1/012012/pdf
DOI  :  10.1088/1742-6596/453/1/012012

来源: IOP

【 摘 要 】

We place tight constraints on the growth index γ by using the recent growth history results of 2dFGRS, SDSS-LRG, VIMOS-VLT deep Survey (VVDS), and WiggleZ datasets. Utilizing a standard likelihood analysis, we find that the use of the combined growth data provided by the previous mentioned galaxy surveys, puts the most stringent constraints on the value of the growth index. Assuming a constant growth index, we obtain that γ = 0.602±0.055 for the concordance ΛCDM expansion model. Based on the Dvali-Gabadadze-Porrati gravity model, we find γ = 0.503±0.06 which is lower, and almost 3σ away, from the theoretically predicted value of γDGP 11/16 implying that the present growth rate data disfavor the DGP gravity.