  Suppression of the scalar power spectrum on large scales is one way to
reconcile the tension between Planck and BICEP2 data. This suppression can
occur by introducing a phase transition from the fast-roll phase to the
slow-roll phase in a single field inflation model. In this paper we consider a
deformed single field inflation model in terms of three SO(3) symmetric moduli
fields. We find that spatially linear solutions for the moduli fields induces a
phase transition during the early stage of the inflation and the suppression of
scalar power spectrum at large scale perturbation modes.
