Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-03-29
Phys.Rev. D66 (2002) 083503
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 1 figure, revised version with small corrections to match version in print. Results and conclusions unchanged
Scientific paper
10.1103/PhysRevD.66.083503
At low energy, the four-dimensional effective action of the ekpyrotic model of the universe is equivalent to a slightly modified version of the pre big bang model. We discuss cosmological perturbations in these models. In particular we address the issue of matching the perturbations from a collapsing to an expanding phase in full generality. We show that, generically, one obtains $n=0$ for the spectrum of scalar perturbations in the original pre big model (with vanishing potential). When an exponential potential for the dilaton is included, a scale invariant spectrum ($n=1$) of adiabatic scalar perturbations is produced under very generic matching conditions, both in a modified pre big bang and ekpyrotic scenario. We also derive general results valid for power law scale factors matched to a radiation dominated era.
Durrer Ruth
Vernizzi Filippo
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