Dynamics of scalar perturbations in f(R, T) gravity

被引：254
|
作者：
Alvarenga, F. G. [1 ]
de la Cruz-Dombriz, A. [2 ,3 ]
Houndjo, M. J. S. [1 ]
Rodrigues, M. E. [4 ]
Saez-Gomez, D. [2 ,3 ,5 ]
机构：
[1] Univ Fed Espirito Santo, CEUNES, Dept Engn & Ciencias Nat, BR-29933415 Sao Mateus, ES, Brazil
[2] Univ Cape Town, ACGC, ZA-7701 Cape Town, South Africa
[3] Univ Cape Town, Dept Math & Appl Math, ZA-7701 Cape Town, South Africa
[4] Univ Fed Espirito Santo, Ctr Ciencias Exatas, Dept Fis, BR-29075910 Vitoria, ES, Brazil
[5] Euskal Herriko Unibertsitatea, Fis Teorikoaren & Zientziaren Hist Saila, Zientzia & Teknol Fak, Bilbao 48080, Spain
来源：
PHYSICAL REVIEW D | 2013年 / 87卷 / 10期
关键词：
EXTENDED THEORIES; RECONSTRUCTION;
D O I：
10.1103/PhysRevD.87.103526
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In the context of f(R, T) theories of gravity, we study the evolution of scalar cosmological perturbations in the metric formalism. According to restrictions on the background evolution, a specific model within these theories is assumed in order to guarantee the standard continuity equation. Using a completely general procedure, we find the complete set of differential equations for the matter density perturbations. In the case of sub-Hubble modes, the density contrast evolution reduces to a second-order equation. We show that for well-motivated f(R, T) Lagrangians the quasistatic approximation yields to very different results from the ones derived in the frame of the concordance Lambda CDM model constraining severely the viability of such theories.
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收藏
页数：9
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