Abstract
In this paper we consider inflation as a probe of new physics near the string or Planckscale. We discuss how new physics can be captured by the choice of vacuum, and how thisleads to modifications of the primordial spectrum as well as the way in which the universeexpands during inflation. Provided there is a large number of fields contributing to thevacuum energy—as typically is expected in string theory—we will argue that both types ofeffects can be present simultaneously and be of observational relevance. Our conclusion isthat the ambiguity in choice of vacuum is an interesting new parameter in serious modelbuilding.
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