Nonlocal gravity and structure in the Universe

被引：37

作者：

Dodelson, Scott ^{[1
,2
,3
]}

Park, Sohyun ^{[4
]}

机构：

[1] Fermilab Natl Accelerator Lab, Fermilab Ctr Particle Astrophys, Batavia, IL 60510 USA

[2] Univ Chicago, Enrico Fermi Inst, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[3] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[4] Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 04期

基金：

美国国家科学基金会;

关键词：

GENERAL-RELATIVITY; DARK ENERGY; GROWTH;

D O I：

10.1103/PhysRevD.90.043535

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The observed acceleration of the Universe can be explained by modifying general relativity. One such attempt is the nonlocal model of Deser and Woodard. Here we fix the background cosmology using results from the Planck satellite and examine the predictions of nonlocal gravity for the evolution of structure in the Universe, confronting the model with three tests: gravitational lensing, redshift space distortions, and an estimator of gravity E-G that combines spectroscopic information with lensing. Current data favor general relativity (GR) over nonlocal gravity: fixing primordial cosmology with the best fit parameters from Planck leads to weak lensing results favoring GR by 6.8 sigma; redshift space distortions measurements of the growth rate preferring GR by 7.8 sigma; and the single measurement of E-G favoring GR, but by less than 1 sigma. The significance holds up even after the parameters are allowed to vary within Planck limits. The larger lesson is that a successful modified gravity model will likely have to suppress the growth of structure compared to general relativity.

引用

页数：5

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