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• W2013934068 abstract "A step feature in the inflaton potential can model a transient breakdown of slow-roll inflation. Here we generalize the step feature to include space-dependence, allowing it also to model a breakdown of homogeneity and isotropy. The space-dependent inflaton potential generates a classical curvature perturbation mode characterized by the wavenumber of the step inhomogeneity. For inhomogeneities small compared with the horizon at the step, space-dependence has a small effect on the curvature perturbation. Therefore the smoothly oscillating quantum power spectrum predicted by the homogeneous step is robust with respect to sub-horizon space-dependence. For inhomogeneities equal to or greater than the horizon at the step, the space-dependent classical mode can dominate, producing a curvature perturbation in which modes of wavenumber determined by the step inhomogeneity are superimposed on the oscillating power spectrum. Generation of a space-dependent step feature may therefore provide a mechanism to introduce primordial anisotropy into the curvature perturbation. Space-dependence also modifies the quantum fluctuations, in particular via resonance-like features coming from mode coupling to amplified superhorizon modes. However these effects are small relative to the classical modes." @default.
• W2013934068 created "2016-06-24" @default.
• W2013934068 creator A5056696512 @default.
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• W2013934068 date "2009-01-20" @default.
• W2013934068 modified "2023-09-27" @default.
• W2013934068 title "Space-dependent step features: Transient breakdown of slow-roll, homogeneity, and isotropy during inflation" @default.
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• W2013934068 doi "https://doi.org/10.1103/physrevd.79.023511" @default.
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