More on the Non-Gaussianity of Perturbations in a Nonminimal Inflationary Model. (15th August 2018)

• Record Type: Journal Article
• Authors: Shojaee, R.; Nozari, K.; Darabi, F.
• Other Names: Vagenas Elias C. Academic Editor.
• Is Part Of: Advances in high energy physics. Volume 2018(2018)
• Publication Date: 2018-08-15
• Subjects: Particles (Nuclear physics) -- Periodicals; Particles (Nuclear physics); Periodicals; 539.76
• DOI: 10.1155/2018/2343896
• Languages: English
• ISSNs: 1687-7357

Abstract

Abstract : We study nonlinear cosmological perturbations and their possible non-Gaussian character in an extended nonminimal inflation where gravity is coupled nonminimally to both the scalar field and its derivatives. By expansion of the action up to the third order, we focus on the nonlinearity and non-Gaussianity of perturbations in comparison with recent observational data. By adopting an inflation potential of the form V ( ϕ ) = 1 / n λ ϕ n, we show that, for n = 4, for instance, this extended model is consistent with observation if 0.013 < λ < 0.095 in appropriate units. By restricting the equilateral amplitude of non-Gaussianity to the observationally viable values, the coupling parameter λ is constrained to the values λ < 0.1 .