PT Journal
AU Motohashi, H
   Starobinsky, AA
TI f (R) constant-roll inflation
SO European Physical Journal C
JI Eur. Phys. J. C
PY 2017
BP 538
EP 8pp
VL 77
IS 8
DI 10.1140/epjc/s10052-017-5109-x
LA English
AB The previously introduced class of two-parametric phenomenological inflationary models in general relativity in which the slow-roll assumption is replaced by the more general, constant-roll condition is generalized to the case of f (R) gravity. A simple constant-roll condition is defined in the original Jordan frame, and exact expressions for a scalaron potential in the Einstein frame, for a function f (R) (in the parametric form) and for inflationary dynamics are obtained. The region of the model parameters permitted by the latest observational constraints on the scalar spectral index and the tensor-to-scalar ratio of primordial metric perturbations generated during inflation is determined.
ER