On the non-Gaussianity from recombination

被引：32

作者：

Bartolo, Nicola ^{[1
,2
]}

Riotto, Antonio ^{[2
,3
]}

机构：

[1] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy

[2] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[3] CERN, PH TH Div, CH-1211 Geneva 23, Switzerland

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2009年 / 03期

关键词：

physics of the early universe; cosmological perturbation theory; CMBR theory; COSMOLOGICAL PERTURBATIONS; INFLATION;

D O I：

10.1088/1475-7516/2009/03/017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The non-linear effects operating at the recombination epoch generate a non-Gaussian signal in the CMB anisotropies. Such a contribution is relevant because it represents a major part of the second-order radiation transfer function which must be determined in order to have a complete control of both the primordial and non-primordial part of non-Gaussianity in the CMB anisotropies. We provide an estimate of the level of non-Gaussianity in the CMB arising from the recombination epoch which shows up mainly in the equilateral configuration. We find that it causes a contamination to the possible measurement of the equilateral primordial bispectrum shifting the minimum detectable value of the non-Gaussian parameter f(NL)(equil) by Delta f(NL)(equil) = O(10) for an experiment like Planck.

引用

页数：13

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