Perturbations in the Ekpyrotic Scenarios

Details Perturbations in the Ekpyrotic Scenarios Perturbations in the Ekpyrotic Scenarios

2002-04-26

arxiv.org/abs/hep-th/0204227v1

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, no figure, uses moriond.sty, to appear in the proceeding of the Moriond cosmology meeting held at Les Arcs, France (M

Scientific paper

With the new cosmological data gathered over the last few years, the inflationary paradigm has seen its predictions largely unchallenged. A recent proposal, called the ekpyrotic scenario, was argued to be a viable competitor as it was claimed that the spectrum of primordial perturbations it produces is scale invariant. By investigating closely this scenario, we show that the corresponding spectrum depends explicitly on an arbitrary function of wavenumber and is therefore itself arbitrary. It can at will be set scale invariant. We conclude that the scenario is not predictive at this stage.

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