Non-Gaussianity from Symmetry
Astrophysics
2009-06-23 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We point out that a light scalar field fluctuating around a symmetry-enhaced point can generate large non-Gaussianity in density fluctuations. We name such a particle as an "ungaussiton", a scalar field dominantly produced by the quantum fluctuations,generating sizable non-Gaussianity in the density fluctuations. We derive a consistency relation between the bispectrum and the trispectrum, tau_NL = 10^3 f_NL^(4/3), which can be extended to arbitrary high order correlation functions. If such a relation is confirmed by future observations, it will strongly support this mechanism.
Cite
@article{arxiv.0804.0425,
title = {Non-Gaussianity from Symmetry},
author = {Teruaki Suyama and Fuminobu Takahashi},
journal= {arXiv preprint arXiv:0804.0425},
year = {2009}
}
Comments
26 pages, 1 figure;v2 discussion and references added. To appear in JCAP