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Journal Article
Mutated hilltop inflation revisited
2018
Overview
In this work we re-investigate pros and cons of mutated hilltop inflation. Applying Hamilton–Jacobi formalism we solve inflationary dynamics and find that inflation goes on along the W-1 branch of the Lambert function. Depending on the model parameter mutated hilltop model renders two types of inflationary solutions: one corresponds to small inflaton excursion during observable inflation and the other describes large field inflation. The inflationary observables from curvature perturbation are in tune with the current data for a wide range of the model parameter. The small field branch predicts negligible amount of tensor to scalar ratio r∼O(10-4), while the large field sector is capable of generating high amplitude for tensor perturbations, r∼O(10-1). Also, the spectral index is almost independent of the model parameter along with a very small negative amount of scalar running. Finally we find that the mutated hilltop inflation closely resembles the α-attractor class of inflationary models in the limit of αϕ≫1.
Publisher
Springer Nature B.V
Subject
