On the trispectrum of Galileon inflation

Journal Article · Fri Nov 01 04:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/11/005· OSTI ID:22369950

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

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1. INFN, Sezione di Padova, via Marzolo 8, Padova, I–35131 (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 present a detailed study of the trispectrum of the curvature perturbation generated within a stable, well defined and predictive theory which comprises an inflationary phase. In this model the usual shift symmetry is enhanced up to the so-called Galileon symmetry. The appeal of this type of theories rests on being unitary and stable under quantum corrections. Furthermore, in the specific model under consideration here, these properties have been shown to approximately hold in realistic scenarios which account for curved spacetime and the coupling with gravity. In the literature, the analysis of the bispectrum of the curvature perturbation for this theory revealed non-Gaussian features which are shared by a number of inflationary models, including stable ones. It is therefore both timely and useful to investigate further and turn to observables such as the trispectrum. We find that, in a number of specific momenta configurations, the trispectrum shape-functions present strikingly different features as compared to, for example, the entire class of the so-called P(X,φ) inflationary models.

• OSTI ID: 22369950
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 11 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPARATIVE EVALUATIONS
CONFIGURATION
COUPLING
DISTURBANCES
FUNCTIONS
GRAVITATION
PERTURBATION THEORY
SHAPE
SPACE-TIME
SYMMETRY