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arxiv: 1301.5699 · v2 · submitted 2013-01-24 · ✦ hep-th · astro-ph.CO

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A Single Field Inflation Model with Large Local Non-Gaussianity

Xingang Chen , Hassan Firouzjahi , Mohammad Hossein Namjoo , Misao Sasaki
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classification ✦ hep-th astro-ph.CO
keywords fieldmodelsingleconditioninflationlargelocalnon-gaussianity
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A detection of large local form non-Gaussianity is considered to be able to rule out all single field inflation models. This statement is based on a single field consistency condition. Despite the awareness of some implicit assumptions in the derivation of this condition and the demonstration of corresponding examples that illustrate these caveats, to date there is still no explicit and self-consistent model which can serve as a counterexample to this statement. We present such a model in this Letter.

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  1. Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the $\delta{N}$ formalism

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    A shear-free lattice method bridges stochastic inflation and δN formalism by enabling fully nonlinear calculations of curvature perturbations in single-field models with ultra-slow-roll phases.