Coexistence of matter dominated and accelerating solutions in f(G) gravity

被引：82

作者：

Goheer, Naureen ^{[1
]}

Goswami, Rituparno ^{[1
]}

Dunsby, Peter K. S. ^{[1
,2
]}

Ananda, Kishore ^{[1
]}

机构：

[1] Univ Cape Town, Dept Math & Appl Math, ZA-7701 Cape Town, South Africa

[2] S African Astron Observ, ZA-7925 Cape Town, South Africa

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

PROBE WMAP OBSERVATIONS; DARK ENERGY; COSMOLOGICAL CONSEQUENCES; CONSTRAINTS; OMEGA(LAMBDA); SUPERNOVAE; INFLATION; EQUATION; OMEGA(M); TENSOR;

D O I：

10.1103/PhysRevD.79.121301

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Working within the theory of modified Gauss-Bonnet gravity, we show that Friedmann-Lemaietre-Robertson-Walker-like power-law solutions only exist for a very special class of f(G) theories. Furthermore, we point out that any transition from decelerated to accelerated expansion must pass through G = 0, and no function f(G) that is differentiable at this point can admit both a decelerating power-law solution and any accelerating solution. This strongly constrains the cosmological viability of f(G) gravity, since it may not be possible to obtain an expansion history of the Universe which is compatible with observations. We explain why the same issue does not occur in f(R) gravity and discuss possible caveats for the case of f(G) gravity.

引用

页数：5

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