The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields

被引：66

作者：

Caprini, Chiara ^{[1
]}

Finelli, Fabio ^{[2
,3
,4
]}

Paoletti, Daniela ^{[2
,5
,6
]}

Riotto, Antonio ^{[7
,8
]}

机构：

[1] CEA, IPhT & CNRS, URA 2306, F-91191 Gif Sur Yvette, France

[2] INAF IASF Bologna, I-40129 Bologna, Italy

[3] INAF OAB, I-40127 Bologna, Italy

[4] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

[5] Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy

[6] Ist Nazl Fis Nucl, I-44100 Ferrara, Italy

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

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

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2009年 / 06期

关键词：

primordial magnetic fields; non-gaussianity; NON-GAUSSIANITY; GAUGE-FIELDS; INFLATION; GENERATION;

D O I：

10.1088/1475-7516/2009/06/021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We evaluate the angular bispectrum of the CMB temperature anisotropy at large angular scale due to a stochastic background of primordial magnetic fields. The shape of non-Gaussianity depends on the spectral index of the magnetic field power spectrum and is peaked in the squeezed configuration for a scale-invariant magnetic spectrum. By using the large angular part of the bispectrum generated by magnetic fields, the present bounds on non-Gaussianity set a limit on the amplitude of the primordial magnetic field of the order of O(10) nGauss for the scale-invariant case and O(20) nGauss for the other spectral indexes.

引用

页数：29

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