Alternative approach to the Starobinsky model for inflation scenarios
arXiv:2211.05212 · doi:10.1103/PhysRevD.107.023527
Abstract
The model of gravity with the corresponding shallow potential in the Einstein frame is consistent with the observations. Recently, many efforts have been made to generalize the (Starobinsky) model of inflation or use other shallow potentials to construct a model for the early Universe. We revise the question about the shallow potential. We propose a model in which the Starobinsky model can emerge through a dynamical mechanism. We show that the absence of ghost modes results to constraints on the parameters of the Starobinsky model. We obtain the scalar spectral index and the tensor-to-scalar ratio of the extended model and study the three-point correlation function of the curvature perturbation to estimate the primordial non-Gaussianities of the proposed model.
24 pages, 4 figures. v4: corrections to language and references; added affiliation; to appear in Phys. Rev. D. arXiv admin note: substantial text overlap with arXiv:2012.10889
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