We revisit a polynomial chaotic inflation model in supergravity which we proposed soon after the Planck first data release. Recently some issues have been raised in Ref. , concerning the validity of our polynomial chaotic inflation model. We study the inflaton dynamics in detail, and confirm that the inflaton potential is very well approximated by a polynomial potential for the parameters of our interest in any practical sense, and in particular, the spectral index and the tensor-to-scalar ratio can be estimated by single-field approximation. This justifies our analysis of the polynomial chaotic inflation in supergravity. © 2014.
Nakayama, K., Takahashi, F., & Yanagida, T. T. (2014). Polynomial chaotic inflation in supergravity revisited. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 737, 151–155. https://doi.org/10.1016/j.physletb.2014.08.043