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

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

2009-03-08

arxiv.org/abs/0903.1420v2

JCAP 0906:021,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Replaced with revised version accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2009/06/021

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.

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