We consider a minimum uncertainty vacuum choice at a fixed energy scale A as an effective description of trans-Planckian physics, and discuss its implications for the linear perturbations of a massless scalar field in power-law inflationary models. We find possible effects with a magnitude of order H/Lambda in the power spectrum, in analogy with previous results for de Sitter space-time. (C) 2003 Elsevier B.V. All rights reserved.
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