Inflation in Mimetic f (G) Gravity

被引：39

作者：

Zhong, Yi ^{[1
,2
,3
]}

Saez-Chillon Gomez, Diego ^{[1
,2
]}

机构：

[1] CSIC, ICE, Carrer Can Magrans S-N, Barcelona 08193, Spain

[2] IEEC, Barcelona 08034, Spain

[3] Lanzhou Univ, Inst Theoret Phys, Lanzhou 730000, Peoples R China

来源：

SYMMETRY-BASEL | 2018年 / 10卷 / 05期

关键词：

modified gravity; inflation; dark energy; dark matter; PROBE WMAP OBSERVATIONS; DARK ENERGY; DENSITY PERTURBATIONS; F(R) GRAVITY; CONSTRAINTS; COSMOLOGY; ACCELERATION; PHYSICS; MODELS; GHOST;

D O I：

10.3390/sym10050170

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Mimetic gravity is analysed in the framework of some extensions of general relativity (GR), whereby a function of the Gauss-Bonnet invariant in four dimensions is considered. By assuming the mimetic condition, the conformal degree of freedom is isolated, and a pressureless fluid naturally arises. Then, the complete set of field equations for mimetic Gauss-Bonnet gravity is established, and some inflationary models are analysed, for which the corresponding gravitational action is reconstructed. The spectral index and tensor-to-scalar ratio are obtained and compared with observational bounds from Planck and BICEP2/Keck array data. Full agreement with the above data is achieved for several versions of the mimetic Gauss-Bonnet gravity. Finally, some extensions of Gauss-Bonnet mimetic gravity are considered, and the possibility of reproducing inflation is also explored.

引用

页数：18

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