We study the generation of primordial perturbations in a (single-field)slow-roll inflationary universe. In momentum space, these (Gaussian)perturbations are characterized by a zero mean and a non-zero variance$\Delta^2(k, t)$. However, in position space the variance diverges in theultraviolet. The requirement of
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![Revising the observable consequences of slow-roll inflation. (arXiv:0911.0961v1 [hep-th])](http://img150.en.redtram.com/news/229132201.jpg "Revising the observable consequences of slow-roll inflation. (arXiv:0911.0961v1 [hep-th])")
