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Published January 24, 2013 | Published
Journal Article Open

Decoherence problem in an ekpyrotic phase

Abstract

Quantum decoherence and the transition to semiclassical behavior during inflation have been extensively considered in the literature. In this paper, we use a simple model to analyze the same process in ekpyrosis. Our result is that the quantum to classical transition would not happen during an ekpyrotic phase even for superhorizon modes, and therefore the fluctuations cannot be interpreted as classical. This implies the prediction of a scale-free power spectrum in an ekpyrotic/cyclic universe model requires more inspection.

Additional Information

© 2013 American Physical Society. Received 15 October 2012; published 24 January 2013. This work is supported by the U.S. Department of Energy. We especially thank S. M. Carroll for very useful comments and suggestions.

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Published - PhysRevD.87.023518.pdf

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