Constant-roll inflation in f(T) teleparallel gravity

被引：81

作者：

Awad, A. ^{[1
,2
]}

El Hanafy, W. ^{[3
,4
]}

Nashed, G. G. L. ^{[3
,4
,5
]}

Odintsov, S. D. ^{[6
,7
,8
,9
]}

Oikonomou, V. K. ^{[8
,10
,11
]}

机构：

[1] Amer Univ Cairo, Sch Sci & Engn, Dept Phys, POB 74,AUC Ave New Cairo, Cairo 11835, Egypt

[2] Ain Shams Univ, Fac Sci, Phys Dept, Cairo 11566, Egypt

[3] British Univ Egypt, Ctr Theoret Phys, POB 43, Cairo 11837, Egypt

[4] Cairo Univ, ERG, Giza 12613, Egypt

[5] Ain Shams Univ, Fac Sci, Math Dept, Cairo 11566, Egypt

[6] ICREA, Passeig Luis Co 23, Barcelona 08010, Spain

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

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

[9] Kazan Fed Univ, Inst Phys, Kazan 420008, Russia

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

[11] Aristotle Univ Thessaloniki, Dept Phys, Thessaloniki 54124, Greece

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 07期

关键词：

cosmic singularity; cosmological perturbation theory; inflation; modified gravity; RECONSTRUCTION; CURVATURE; FLATNESS; UNIVERSE; HORIZON;

D O I：

10.1088/1475-7516/2018/07/026

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate in detail the implications of the constant-roll condition on the inflationary era of a scalar field coupled to a teleparallel f(T) gravity. The resulting cosmological equations constitute a reconstruction technique which enables us to find either the f(T) gravity which corresponds to a given cosmological evolution, or the Hubble rate of the cosmological evolution generated by a fixed f(T) gravity. We also analyze in some detail the phase space of the constant-roll teleparallel gravity and we discuss the physical significance of the resulting fixed points and trajectories. Also we calculate the observational indices of a theory with given f(T) gravity, and we discuss all the implications of the constant-roll condition on these. As we demonstrate, the resulting theory can be compatible with the current observational data, for a wide range of values of the free parameters of the theory.

引用

页数：29

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