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Published on: September 26, 2014
Natural Covariant Planck Scale Cutoffs and the Cosmic Microwave Background Spectrum
Aidan Chatwin-Davies1, Achim Kempf2, Robert T W Martin3
1Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA.
Abstract:
We calculate the impact of quantum gravity-motivated ultraviolet cutoffs on inflationary predictions for the cosmic microwave background spectrum. We model the ultraviolet cutoffs fully covariantly to avoid possible artifacts of covariance breaking. Imposing these covariant cutoffs results in the production of small, characteristically k-dependent oscillations in the spectrum. The size of the effect scales linearly with the ratio of the Planck to Hubble lengths during inflation. Consequently, the relative size of the effect could be as large as one part in 10^{5}; i.e., eventual observability may not be ruled out.
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