Growth Rate of Cosmological Perturbations at z ∼ 0.1 from a New Observational Test

被引：90

作者：

Feix, Martin ^{[1
]}

Nusser, Adi ^{[1
,2
]}

Branchini, Enzo ^{[3
,4
,5
]}

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[2] Technion Israel Inst Technol, Asher Space Sci Inst, IL-32000 Haifa, Israel

[3] Univ Rome Tre, Dept Phys, I-00146 Rome, Italy

[4] Ist Nazl Fis Nucl, Sez Roma, I-00146 Rome, Italy

[5] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 01期

基金：

以色列科学基金会;

关键词：

2MASS REDSHIFT SURVEY; COSMIC STRUCTURE; POWER SPECTRUM; DARK ENERGY; SPACE; GALAXIES; DISTORTIONS; EVOLUTION; GRAVITY; LRG;

D O I：

10.1103/PhysRevLett.115.011301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spatial variations in the distribution of galaxy luminosities, estimated from redshifts as distance proxies, are correlated with the peculiar velocity field. Comparing these variations with the peculiar velocities inferred from galaxy redshift surveys is a powerful test of gravity and dark-energy theories on cosmological scales. Using similar to 2 x 10(5) galaxies from the SDSS Data Release 7, we perform this test in the framework of gravitational instability to estimate the normalized growth rate of density perturbations f sigma(8) = 0.37 +/- 0.13 at z similar to 0.1, which is in agreement with the cold dark matter model with a cosmological constant. This unique measurement is complementary to those obtained with more traditional methods, including clustering analysis. The estimated accuracy at z similar to 0.1 is competitive with other methods when applied to similar data sets.

引用

页数：5

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