Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-20
Astronomy and Astrophysics
Astrophysics
3 pages, one reference is added
Scientific paper
There are several works searching for a clue of trans-Planckian physics on the primordial density perturbation spectrum. Here we would like to point out an important aspect which has been overlooked so far. When we consider a model in which the primordial density perturbation spectrum is modified due to trans-Planckian physics, the energy density of fluctuations of the inflaton field necessarily becomes significantly large, and hence its back reaction to the cosmic expansion rate cannot be neglected.
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