Mutated hilltop inflation revisited
  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 ${\cal W}_{-1}$ 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 $r\sim
\mathcal{O}(10^{-4})$, while the large field sector is capable of generating
high amplitude for tensor perturbations, $r\sim \mathcal{O}(10^{-1})$. 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 $\alpha$-attractor class of
inflationary models in the limit of $\alpha\phi\gg 1$.
