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Title: The trispectrum in the effective theory of inflation with Galilean symmetry

We calculate the trispectrum of curvature perturbations for a model of inflation endowed with Galilean symmetry at the level of the fluctuations around an FRW background. Such a model has been shown to posses desirable properties such as non-renormalization of the leading operators. The cubic curvature fluctuations of this model produce quite distinct signatures at the level of the bispectrum. Our analysis shows how this holds true at higher order in perturbations. We provide a detailed study of the trispectrum shape-functions in different configurations and a comparison with existent literature. Most notably, predictions markedly differ from their P(X,φ) counterpart in the so called equilateral trispectrum configuration.
Authors:
 [1] ;  [2] ;  [3]
  1. Dipartimento di Fisica e Astronomia ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131 Padova (Italy)
  2. School of Physics and Astronomy, University of Minnesota, Minneapolis, 55455 (United States)
  3. Department of Physics, Case Western Reserve University, Cleveland, 44106 (United States)
Publication Date:
OSTI Identifier:
22282653
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; COSMOLOGY; FIELD OPERATORS; FLUCTUATIONS; INFLATIONARY UNIVERSE; INFLATONS; PERTURBATION THEORY; RENORMALIZATION; SYMMETRY