Clear and Measurable Signature of Modified Gravity in the Galaxy Velocity Field

被引：71

作者：

Hellwing, Wojciech A. ^{[1
,2
]}

Barreira, Alexandre ^{[1
,3
]}

Frenk, Carlos S. ^{[1
]}

Li, Baojiu ^{[1
]}

Cole, Shaun ^{[1
]}

机构：

[1] Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England

[2] Univ Warsaw, Interdisciplinary Ctr Math & Computat Modelling I, Warsaw, Poland

[3] Univ Durham, Dept Phys, Inst Particle Phys Phenomenol, Durham DH1 3LE, England

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 22期

基金：

英国科学技术设施理事会;

关键词：

REDSHIFT-SPACE DISTORTIONS; BARYON ACOUSTIC PEAK; DEPENDENCE; DENSITY; MATTER; EVOLUTION; SPECTRA; Z=0.57;

D O I：

10.1103/PhysRevLett.112.221102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The velocity field of dark matter and galaxies reflects the continued action of gravity throughout cosmic history. We show that the low-order moments of the pairwise velocity distribution v(12) are a powerful diagnostic of the laws of gravity on cosmological scales. In particular, the projected line-of-sight galaxy pairwise velocity dispersion sigma(12)(r) is very sensitive to the presence of modified gravity. Using a set of high-resolution N-body simulations, we compute the pairwise velocity distribution and its projected line-of-sight dispersion for a class of modified gravity theories: the chameleon f(R) gravity and Galileon gravity (cubic and quartic). The velocities of dark matter halos with a wide range of masses would exhibit deviations from general relativity at the (5-10)sigma level. We examine strategies for detecting these deviations in galaxy redshift and peculiar velocity surveys. If detected, this signature would be a "smoking gun" for modified gravity.

引用

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