Non-Gaussianity from Symmetry

Details Non-Gaussianity from Symmetry Non-Gaussianity from Symmetry

2008-04-02

arxiv.org/abs/0804.0425v2

JCAP 0809:007,2008

Astronomy and Astrophysics

Astrophysics

26 pages, 1 figure;v2 discussion and references added. To appear in JCAP

Scientific paper

10.1088/1475-7516/2008/09/007

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.

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