Optimal bispectrum constraints on single-field models of inflation

被引：4

作者：

Anderson, Gemma J. ^{[1
]}

Regan, Donough ^{[1
]}

Seery, David ^{[1
]}

机构：

[1] Univ Sussex, Ctr Astron, Brighton BN1 9QH, E Sussex, England

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2014年 / 07期

基金：

欧洲研究理事会; 英国科学技术设施理事会;

关键词：

inflation; non-gaussianity; EXPECTATION VALUE FORMALISM; COSMOLOGICAL CORRELATIONS; QUANTUM CONTRIBUTIONS; PERTURBATIONS;

D O I：

10.1088/1475-7516/2014/07/017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use WMAP 9-year bispectrum data to constrain the free parameters of an 'effective field theory' describing fluctuations in single-field inflation. The Lagrangian of the theory contains a finite number of operators associated with unknown mass scales. Each operator produces a fixed bispectrum shape, which we decompose into partial waves in order to construct a likelihood function. Based on this likelihood we are able to constrain four linearly independent combinations of the mass scales. As an example of our framework we specialize our results to the case of 'Dirac-Born-Infeld' and 'ghost' inflation and obtain the posterior probability for each model, which in Bayesian schemes is a useful tool for model comparison. Our results suggest that DBI-like models with two or more free parameters are disfavoured by the data by comparison with single-parameter models in the same class.

引用

页数：33

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