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The phenomenon of resonant production of particles {\it after} inflation hasreceived much attention in the past few years. In a new application of resonantproduction of particles, we consider the effect of a resonance {\em during}inflation. We show that if the inflaton is coupled to a massive particle,resonant production of the particle during inflation modifies the evolution ofthe inflaton, and may leave an imprint in the form of sharp features in theprimordial power spectrum. Precision measurements of microwave backgroundanisotropies and large-scale structure surveys could be sensitive to thefeatures, and probe the spectrum of particles as massive as the Planck scale.Comment: 19 pages, 11 eps figure

Probing Planckian physics: Resonant production of particles during inflation and features in the primordial power spectrum