Viable mimetic completion of unified inflation-dark energy evolution in modified gravity

被引：57

作者：

Nojiri, S. ^{[1
,2
]}

Odintsov, S. D. ^{[3
,4
,5
]}

Oikonomou, V. K. ^{[6
]}

机构：

[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan

[2] Nagoya Univ, Kobayashi Maskawa Inst Origin Particles & Univers, Nagoya, Aichi 4648602, Japan

[3] CSIC, Inst Space Sci IEEC, C Can Magrans S-N, Barcelona 08193, Spain

[4] Passeig Luis Co, ICREA, Barcelona 08010, Spain

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

[6] Tomsk State Univ Control Syst & Radioelect TUSUR, Lab Theoret Cosmol, Tomsk 634050, Russia

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 10期

关键词：

GENERALIZED GRAVITY; CONSTRAINTS; CONSISTENT;

D O I：

10.1103/PhysRevD.94.104050

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we demonstrate that a unified description of early and late-time acceleration is possible in the context of mimetic Fd(R) gravity. We study the inflationary era in detail and demonstrate that it can be realized even in mimetic Fd(R) gravity where traditional Fd(R) gravity fails to describe the inflation. By using standard methods we calculated the spectral index of primordial curvature perturbations and the scalar-to-tensor ratio. We use two Fd(R)gravity models and as it turns out, for both the models under study the observational indices are compatible with both the latest Planck and the BICEP2/Keck array data. However, this is only true under some model-dependent fine-tuning, which constrains the models we study. Finally, the graceful exit from inflation issue is addressed, and as we show, the curvature perturbations may trigger the graceful exit from inflation when the slow-roll era ends. However, fine-tuning is needed in order to produce enough inflation by the end of the slow-roll era.

引用

页数：14

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