https://doi.org/10.1140/epjc/s10052-018-5856-3
Regular Article - Theoretical Physics
Mutated hilltop inflation revisited
Department of Mathematics, Netaji Nagar College for Women, Kolkata, 700 092, India
* e-mail: terminatorbarun@gmail.com
Received:
28
December
2017
Accepted:
30
April
2018
Published online:
8
May
2018
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 
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 
, while the large field sector is capable of generating high amplitude for tensor perturbations, 
. 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 
-attractor class of inflationary models in the limit of 
.
© The Author(s), 2018
