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We study the evolution of cosmological fluctuations during and afterinflation driven by a scalar field coupled to a perfect fluid through africtionterm. During the slow-roll regime for the scalar field, the perfect fluid isalso frozen and isocurvature perturbations are generated. After the end ofinflation, during the decay of the inflaton, we find that a change in theobservationally relevant large scale curvature fluctuations is possible.

Evolution of Large Scale Curvature Fluctuations During the Perturbative Decay of the Inflaton