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In this paper we consider the influence of trans-Planckian physics on the CMBR anisotropies produced by inflation. We consider a simple toy model that allows for analytic calculations and argue on general grounds, based on ambiguities in the choice of vacuum, that effects are expected with a magnitude of the order of H/, where H is the Hubble constant during inflation and the scale for new physics, e. g. , the Planck scale.
Ulf Danielsson (Tue,) studied this question.