Are Inflationary Predictions Sensitive to Very High Energy Physics?

Details Are Inflationary Predictions Sensitive to Very High Energy Physics? Are Inflationary Predictions Sensitive to Very High Energy Physics?

2002-10-23

arxiv.org/abs/hep-th/0210233v1

JHEP 0302:048,2003

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, 14 figures

Scientific paper

10.1088/1126-6708/2003/02/048

It has been proposed that the successful inflationary description of density perturbations on cosmological scales is sensitive to the details of physics at extremely high (trans-Planckian) energies. We test this proposal by examining how inflationary predictions depend on higher-energy scales within a simple model where the higher-energy physics is well understood. We find the best of all possible worlds: inflationary predictions are robust against the vast majority of high-energy effects, but can be sensitive to some effects in certain circumstances, in a way which does not violate ordinary notions of decoupling. This implies both that the comparison of inflationary predictions with CMB data is meaningful, and that it is also worth searching for small deviations from the standard results in the hopes of learning about very high energies.

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