Non-Gaussian Signatures from the Postinflationary Early Universe
Astrophysics
2010-01-11 v2 High Energy Physics - Phenomenology
Abstract
We consider contributions to non-Gaussianity of the Cosmic Microwave Background (CMB) from remnants of post-inflationary phase transitions in the very early universe. Such signatures can optimistically be used to discover evidence of new particle physics through cosmological observations. More conservatively they provide a potential obstacle to extracting information about the non-Gaussian nature of primordial density fluctuations from any detection in the CMB. We demonstrate this explicitly by computing the bispectrum from global textures, which may be generated from a wide class of particle physics models.
Cite
@article{arxiv.0811.2176,
title = {Non-Gaussian Signatures from the Postinflationary Early Universe},
author = {Alessandra Silvestri and Mark Trodden},
journal= {arXiv preprint arXiv:0811.2176},
year = {2010}
}
Comments
4 pages, 4 figures, revised version accepted for publication in PRL