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A plausible upper limit on the number of e-foldings

Bin Wang, Elcio Abdalla

hep-tharXiv:hep-th/0308145

Abstract

Based solely on the arguments relating Friedmann equation and the Cardy formula we derive a bound for the number of e-folds during inflation for a standard Friedmann-Robertson-Walker as well as non-standard four dimensional cosmology induced by a Randall-Sundrum-type model.

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