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• W1956100339 abstract "We examine the processes of quantum squeezing and decoherence of density perturbations produced during a slowly contracting ekpyrotic phase in which entropic perturbations are converted to curvature perturbations before the bounce to an expanding phase. During the generation phase, the entropic fluctuations evolve into a highly squeezed quantum state, analogous to the evolution of inflationary perturbations. Subsequently, during the conversion phase, quantum coherence is lost very efficiently due to the interactions of entropy and adiabatic modes. Moreover, while decoherence occurs, the adiabatic curvature perturbations inherit their semiclassicality from the entropic perturbations. Our results confirm that, just as for inflation, an ekpyrotic phase can generate nearly scale-invariant curvature perturbations which may be treated as a statistical ensemble of classical density perturbations, in agreement with observations of the cosmic background radiation." @default.
• W1956100339 created "2016-06-24" @default.
• W1956100339 creator A5011975326 @default.
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• W1956100339 date "2014-03-17" @default.
• W1956100339 modified "2023-09-27" @default.
• W1956100339 title "Quantum-to-classical transition for ekpyrotic perturbations" @default.
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• W1956100339 doi "https://doi.org/10.1103/physrevd.89.063516" @default.
• W1956100339 hasPublicationYear "2014" @default.
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