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A fully-covariant natural ultraviolet cutoff in inflationary spacetimes

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The effects that quantum gravity-motivated natural UV cutoffs at the Planck scale have on inflationary predictions for the CMB have garnered much interest in the literature. So far, these studies have been mostly confined to UV cutoffs that are locally Lorentz symmetry-breaking. Here, we propose a locally Lorentz covariant approach which takes the form of a cutoff on the local density of dynamical degrees of freedom of the field theory. This cutoff has an intuitive information theoretic interpretation within the framework of sampling theory, the field of mathematics that connects discrete information with continuous information. We are studying the type and magnitude of possible signatures that this covariant cutoff would have in the CMB .

This talk is part of the DAMTP Friday GR Seminar series.

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