Superbounce and loop quantum ekpyrotic cosmologies from modified gravity: F (R), F (G) and F (T) theories

被引：78

作者：

Odintsov, S. D. ^{[1
,2
,3
,4
]}

Oikonomou, V. K. ^{[3
,4
,5
,8
]}

Saridakis, Emmanuel N. ^{[6
,7
]}

机构：

[1] Inst Ciencies Espai IEEC CSIC, E-08193 Barcelona, Spain

[2] ICREA, Barcelona, Spain

[3] Tomsk State Univ, Natl Res, Tomsk 634050, Russia

[4] Tomsk State Pedag Univ, Tomsk 634061, Russia

[5] Aristotle Univ Thessaloniki, Dept Theoret Phys, Thessaloniki 54124, Greece

[6] Natl Tech Univ Athens, Div Phys, 15780 Zografou Campus, Athens, Greece

[7] Pontificia Univ Catolica Valparaiso, Inst Fis, Valparaiso, Chile

[8] Tomsk State Univ, Control Syst & Radioelect TUSUR, Lab Theor Cosmol, Tomsk 634050, Russia

来源：

ANNALS OF PHYSICS | 2015年 / 363卷

关键词：

F(R) gravity; F(G) gravity; F(T) gravity; Bounce cosmology; Loop quantum cosmology; INFLATIONARY UNIVERSE SCENARIO; GAUSS-BONNET THEORY; DARK; RECONSTRUCTION; SINGULARITY; CONSISTENT; FLATNESS; HORIZON; MODELS; RATES;

D O I：

10.1016/j.aop.2015.08.021

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the realization of two bouncing paradigms, namely of the superbounce and the loop quantum cosmological ekpyrosis, in the framework of various modified gravities. In particular, we focus on the F(R), F(G) and F(T) gravities, and we reconstruct their specific subclasses which lead to such universe evolutions. These subclasses constitute from power laws, polynomials, or hypergeometric ansatzes, which can be approximated by power laws. The qualitative similarity of the different effective gravities which realize the above two bouncing cosmologies, indicates that a universality might be lying behind the bounce. Finally, performing a linear perturbation analysis, we show that the obtained solutions are conditionally or fully stable. (C) 2015 Elsevier Inc. All rights reserved.

引用

页码：141 / 163

页数：23

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