Natural Covariant Planck Scale Cutoffs and the Cosmic Microwave Background Spectrum

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.

5 pages, 3 figures - v2: minor corrections, added references -v3: harmonize with published version

References in corpus (2)

• On Information Theory, Spectral Geometry and Quantum Gravity
• How Decoherence Affects the Probability of Slow-Roll Eternal Inflation

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