Consistency relation and non-Gaussianity in a Galileon inflation

被引：2

作者：

Asadi, Kosar ^{[1
]}

Nozari, Kourosh ^{[1
]}

机构：

[1] Univ Mazandaran, Fac Basic Sci, Dept Phys, POB 47416-95447, Babol Sar, Iran

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2016年 / 12期

关键词：

cosmological parameters from CMBR; inflation; non-gaussianity; PRIMORDIAL NON-GAUSSIANITY; LARGE-SCALE STRUCTURE; DENSITY PERTURBATIONS; NATURAL INFLATION; CONSTRAINTS; COSMOLOGY; CONSTANT; SCENARIO; UNIVERSE; MODELS;

D O I：

10.1088/1475-7516/2016/12/013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study a particular Galileon inflation in the light of Planck2015 observational data in order to constraint the model parameter space. We study the spectrum of the primordial modes of the density perturbations by expanding the action up to the second order in perturbations. Then we pursue by expanding the action up to the third order and find the three point correlation functions to find the amplitude of the non-Gaussianity of the primordial perturbations in this setup. We study the amplitude of the non-Gaussianity both in equilateral and orthogonal configurations and test the model with recent observational data. Our analysis shows that for some ranges of the non-minimal coupling parameter, the model is consistent with observation and it is also possible to have large non-Gaussianity which would be observable by future improvements in experiments. Moreover, we obtain the tilt of the tensor power spectrum and test the standard inflationary consistency relation (r = -8n(T)) against the latest bounds from the Planck2015 dataset. We find a slight deviation from the standard consistency relation in this setup. Nevertheless, such a deviation seems not to be sufficiently remarkable to be detected confidently.

引用

页数：27

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