Large non-Gaussianities in the Effective Field Theory Approach to Single-Field Inflation: the Bispectrum

Nicola Bartolo, Matteo Fasiello, Sabino Matarrese, Antonio Riotto

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Abstract

The methods of effective field theory are used to study generic theories of inflation with a single inflaton field and to perform a general analysis of the associated non-Gaussianities. We investigate the amplitudes and shapes of the various generic three-point correlators, the bispectra, which may be generated by different classes of single-field inflationary models. Besides the well-known results for the DBI-like models and the ghost inflationary theories, we point out that curvature-related interactions may give rise to large non-Gaussianities in the form of bispectra characterized by a flat shape which, quite interestingly, is independently produced by several interaction terms. In a subsequent work, we will perform a similar general analysis for the non-Gaussianities generated by the generic four-point correlator, the trispectrum.
Original languageEnglish
JournalJournal of Cosmology and Astroparticle Physics
DOIs
Publication statusPublished - 6 Apr 2010

Keywords

  • astro-ph.CO
  • gr-qc
  • hep-ph
  • hep-th

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