The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
Cosmology and Nongalactic Astrophysics
2009-10-02 v2
Abstract
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 10 nGauss for the scale-invariant case and 20 nGauss for the other spectral indexes.
Keywords
Cite
@article{arxiv.0903.1420,
title = {The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields},
author = {Chiara Caprini and Fabio Finelli and Daniela Paoletti and Antonio Riotto},
journal= {arXiv preprint arXiv:0903.1420},
year = {2009}
}
Comments
Replaced with revised version accepted for publication in JCAP