The primordial curvature perturbation in the ekpyrotic Universe

Details The primordial curvature perturbation in the ekpyrotic Universe The primordial curvature perturbation in the ekpyrotic Universe

2001-06-14

arxiv.org/abs/hep-ph/0106153v3

Phys.Lett. B524 (2002) 1-4

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages. The Guth-Pi-Olson formalism of the original ekpyrotic paper translated, results from a forthcoming paper reported

Scientific paper

10.1016/S0370-2693(01)01374-0

In the ekpyrotic scenario the Universe is initially collapsing, the energy density coming from a scalar field with a negative exponential potential. On the basis of a calculation ignoring the gravitational back-reaction the authors of the scenario claim that during collapse the vacuum fluctuation creates a perturbation in the comoving curvature, which has a flat spectrum in accordance with observation. In this note the back-reaction is included, and it is found that the spectrum during collapse is strongly scale-dependent with negligible magnitude. The spectrum is continuous across the bounce if the spacetime is smooth, making it unlikely that the ekpyrotic scenario can be compatible with observation.

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