Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-05-23
Phys.Rev.D63:123501,2001
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, 2 figures. One important correction in the Corley/Jacobson case with b_m>0 and some misprints corrected. Version pub
Scientific paper
10.1103/PhysRevD.63.123501
In most current models of inflation based on a weakly self-coupled scalar matter field minimally coupled to gravity, the period of inflation lasts so long that, at the beginning of the inflationary period, the physical wavelengths of comoving scales which correspond to the present large-scale structure of the Universe were smaller than the Planck length. Thus, the usual computations of the spectrum of fluctuations in these models involve extrapolating low energy physics (both in the matter and gravitational sector) into regions where this physics is not applicable. In this paper we demonstrate that the usual predictions of inflation for the spectrum of cosmological fluctuations do indeed depend on the hidden assumptions about super-Planck scale physics. We introduce a class of modified dispersion relations to mimic possible effects of super-Planck scale physics, and show that in some cases important deviations from the usual predictions of inflation are obtained. Some implications of this result for the unification of fundamental physics and early Universe cosmology are discussed.
Brandenberger Robert H.
Martin Jerome
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