Non-Gaussianity from symmetry

Teruaki Suyama, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


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.

Original languageEnglish
Article number007
JournalJournal of Cosmology and Astroparticle Physics
Issue number9
Publication statusPublished - 2008 Sept 1
Externally publishedYes


  • Cosmological perturbation theory
  • Inflation
  • Physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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