Starobinsky-like two-field inflation

被引：54

作者：

Kaneda, Sho ^{[1
]}

Ketov, Sergei V. ^{[1
,2
,3
]}

机构：

[1] Tokyo Metropolitan Univ, Dept Phys, Minami Ohsawa 1-1, Hachioji, Tokyo 1920397, Japan

[2] Univ Tokyo, Kavli Inst Phys & Math Universe IPMU, Chiba 2778568, Japan

[3] Tomsk Polytech Univ, Inst Phys & Technol, 30 Lenin Ave, Tomsk 634050, Russia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2016年 / 76卷 / 01期

关键词：

NATURAL INFLATION; GRAVITY; SPECTRA; PERTURBATIONS; MODELS;

D O I：

10.1140/epjc/s10052-016-3888-0

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider an extension of the Starobinsky model, whose parameters are functions of an extra scalar field. Our motivation is to test the robustness (or sensitivity) of the Starobinsky inflation against mixing scalaron with another (matter) scalar field. We find that the extended Starobinsky model is (classically) equivalent to the two-field inflation, with the scalar potential having a flat direction. For the sake of fully explicit calculations, we perform a numerical scan of the parameter space. Our findings support the viability of the Starobinsky-like two-field inflation for a certain range of its parameters, which is characterized by the scalar index n(s) = 0.96 +/- 0.01, the tensor-to-scalar ratio r < 0.06, and a small running of the scalar index at vertical bar alpha(s)vertical bar < 0.05.

引用

页码：1 / 14

页数：14

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