Intrinsic Bispectra of Cosmic Magnetic Fields
Abstract
Forthcoming datasets from the Planck experiment and others are in a position to probe the CMB non-Gaussianity with higher accuracy than has yet been possible and potentially open a new window into the physics of the very early universe. However, a signal need not necessarily be inflationary in origin, and possible contaminants should be examined in detail. One such is provided by early universe magnetic fields, which can be produced by a variety of models including during an inflationary phase, at phase transitions, or seeded by cosmic defects. Should such fields have been extent in the early universe they provide a natural source of CMB non-Gaussianity. Knowledge of the CMB angular bispectrum requires the complete Fourier-space (or "intrinsic") bispectrum. In this paper I consider in detail the intrinsic bispectra of an early-universe magnetic field for a range of power-law magnetic power spectra.
Keywords
Cite
@article{arxiv.1012.2892,
title = {Intrinsic Bispectra of Cosmic Magnetic Fields},
author = {Iain A. Brown},
journal= {arXiv preprint arXiv:1012.2892},
year = {2015}
}
Comments
31 pages, 13 figures, AASTeX. Replaced with version accepted by ApJ; brief discussion and references added to introduction, discussion at end of paper rephrased and extended, some typos corrected