Hyper-Non-Gaussianities in Inflation with Strongly Nongeodesic Motion.

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ID: 69180
2019
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Abstract
Several recent proposals to embed inflation into high-energy physics rely on inflationary dynamics characterized by a strongly nongeodesic motion in negatively curved field space. This naturally leads to a transient instability of perturbations on sub-Hubble scales, and to their exponential amplification. Supported by first-principles numerical computations, and by the analytical insight provided by the effective field theory of inflation, we show that the bispectrum is enhanced in flattened configurations, and we argue that an analogous result holds for all higher-order correlation functions. These "hyper-non-Gaussianities" thus provide powerful model-independent constraints on nonstandard inflationary attractors motivated by the search for ultraviolet completions of inflation.
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fumagalli2019hypernongaussianitiesphysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Fumagalli, Jacopo;Garcia-Saenz, Sebastian;Pinol, Lucas;Renaux-Petel, Sébastien;Ronayne, John;
Journal physical review letters
Year 2019
DOI
10.1103/PhysRevLett.123.201302
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