The primordial curvature perturbation in the ekpyrotic Universe

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  • 12 July 2001
Abstract
In the ekpyrotic scenario the Universe is initially collapsing, the energy density coming from a scalar field with a negative exponential potential. It has been supposed, on the basis of calculations ignoring the gravitational back-reaction, that the vacuum fluctuation of this field generates the comoving curvature perturbation which is the origin of structure. In this note the back-reaction is included, and it is found that the comoving curvature perturbation is exponentially suppressed during the collapse. In this respect, the ekpyrotic scenario is on the same footing as the pre-big-bang scenario in which there is no potential.

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