Non-Gaussianity from symmetry

Teruaki Suyama; Fuminobu Takahashi

doi:10.1088/1475-7516/2008/09/007

Non-Gaussianity from symmetry

Teruaki Suyama, Fuminobu Takahashi

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

We point out that a light scalar field fluctuating around a symmetry-enhanced point can generate large non-Gaussianity in density fluctuations. We name such a particle 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, τ_NL∼10 ³f_NL^4/3, which can be extended to arbitrarily high order correlation functions. If such a relation is confirmed by future observations, it will strongly support this mechanism.

Original language	English
Article number	007
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2008
Issue number	9
DOIs	https://doi.org/10.1088/1475-7516/2008/09/007
Publication status	Published - 2008 Sept 1
Externally published	Yes

Keywords

Cosmological perturbation theory
Inflation
Physics of the early universe

ASJC Scopus subject areas

Astronomy and Astrophysics

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10.1088/1475-7516/2008/09/007

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AB - We point out that a light scalar field fluctuating around a symmetry-enhanced point can generate large non-Gaussianity in density fluctuations. We name such a particle 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, τNL∼10 3fNL4/3, which can be extended to arbitrarily high order correlation functions. If such a relation is confirmed by future observations, it will strongly support this mechanism.

KW - Cosmological perturbation theory

KW - Inflation

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Non-Gaussianity from symmetry

Abstract

Keywords

ASJC Scopus subject areas

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