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• W2017008897 abstract "The Universe can be made flat and smooth by undergoing a phase of ultraslow (ekpyrotic) contraction, a condition achievable with a single, canonical scalar field and conventional general relativity. It has been argued, though, that generating scale-invariant density perturbations requires at least two scalar fields and a two-step process that first produces entropy fluctuations and then converts them to curvature perturbations. In this Letter we identify a loophole in the argument and introduce an ekpyrotic model based on a single, canonical scalar field that generates nearly scale-invariant curvature fluctuations through a purely ``adiabatic mechanism'' in which the background evolution is a dynamical attractor. The resulting spectrum can be slightly red with distinctive non-Gaussian fluctuations." @default.
• W2017008897 created "2016-06-24" @default.
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• W2017008897 date "2010-03-05" @default.
• W2017008897 modified "2023-09-27" @default.
• W2017008897 title "Adiabatic Ekpyrosis: Scale-Invariant Curvature Perturbations from a Single Scalar Field in a Contracting Universe" @default.
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• W2017008897 doi "https://doi.org/10.1103/physrevlett.104.091301" @default.
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