Inflationary cosmology in unimodular F(T) gravity

被引：54

作者：

Bamba, Kazuharu ^{[1
]}

Odintsov, Sergei D. ^{[2
,3
,4
,5
]}

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

机构：

[1] Fukushima Univ, Fac Symbiot Syst Sci, Div Human Support Syst, Fukushima 9601296, Japan

[2] Inst Ciencies Espai IEEC CSIC, Campus UAB,Carrer Can Magrans S-N, Barcelona 08193, Spain

[3] ICREA, Passeig Lluis Co 23, Barcelona 08010, Spain

[4] Ist Nazl Fis Nucl, Sez Napoli, Via Cinthia 9, I-80126 Naples, Italy

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

[6] Baylor Univ, Dept Phys, CASPER, Waco, TX 76798 USA

[7] Pontificia Univ Catolica Valparaiso, Inst Fis, Casilla 4950, Valparaiso, Chile

来源：

MODERN PHYSICS LETTERS A | 2017年 / 32卷 / 21期

关键词：

Modified gravity; cosmology; DARK ENERGY; MODELS; CONSTANT; UNIVERSE; EQUIVALENT; SYMMETRY; FLATNESS; HORIZON; PLANCK; F(R);

D O I：

10.1142/S0217732317501140

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the inflationary realization in the context of unimodular F(T) gravity, which is based on the F(T) modification of teleparallel gravity, in which one imposes the unimodular condition through the use of Lagrange multipliers. We develop the general reconstruction procedure of the F(T) form that can give rise to a given scale-factor evolution, and then we apply it in the inflationary regime. We extract the Hubble slow-roll parameters that allow us to calculate various inflation-related observables, such as the scalar spectral index and its running, the tensor-to-scalar ratio, and the tensor spectral index. Then, we examine the particular cases of de Sitter and power-law inflation, of Starobinsky inflation, as well as inflation in a specific model of unimodular F(T) gravity. As we show, in all cases the predictions of our scenarios are in a very good agreement with Planck observational data. Finally, inflation in unimodular F(T) gravity has the

引用

页数：21

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