The trispectrum in the effective theory of inflation with Galilean symmetry

Journal Article · Sun Sep 01 04:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/09/037· OSTI ID:22282653

Bartolo, Nicola ^[1]; Dimastrogiovanni, Emanuela ^[2]; Fasiello, Matteo ^[3]

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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)

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.

• OSTI ID: 22282653
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 09 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPARATIVE EVALUATIONS
COSMOLOGY
FIELD OPERATORS
FLUCTUATIONS
INFLATIONARY UNIVERSE
INFLATONS
PERTURBATION THEORY
RENORMALIZATION
SYMMETRY