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The effects of potential shape on inhomogeneous inflation

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Josu C. Aurrekoetxea, Katy Clough, Raphael Flauger, Eugene A. Lim

Original languageEnglish
Article number030
JournalJournal of Cosmology and Astroparticle Physics
Issue number5
PublishedMay 2020

King's Authors


We study the robustness of single-field inflation against inhomogeneities. We derive a simple analytic criterion on the shape of the potential for successful inflation in the presence of inhomogeneities, and demonstrate its validity using full 3+1 dimensional numerical relativity simulations on several classes of popular models of single-field inflation. We find that models with convex potentials are more robust to inhomogeneities than those with concave potentials, and that concave potentials that vary on super-Planckian scales are significantly more robust than those that vary on sub-Planckian scales.

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