Cosmological Structure Problem of the Pre-Big Bang Scenario

Details Cosmological Structure Problem of the Pre-Big Bang Scenario Cosmological Structure Problem of the Pre-Big Bang Scenario

1996-08-08

arxiv.org/abs/hep-th/9608041v2

Astropart.Phys. 8:201-211,1998

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, thoroughly revised, title changed, Astroparticle Physics

Scientific paper

10.1016/S0927-6505(97)00052-2

We calculate the density and gravitational wave spectrums generated in a version of string cosmology termed pre-big bang scenario. The large scale structures are originated from quantum fluctuations of the metric and dilaton field during a pole-like inflation stage driven by a potential-less dilaton field realized in the low-energy effective action of string theory. The generated classical density field and the gravitational wave in the second horizon crossing epoch show tilted spectrums with n ~ 4 and n_T ~ 3, respectively. These differ from the observed spectrum of the large angular scale anisotropy of the cosmic microwave background radiation which supports scale invariant ones with n ~ 1 and n_T ~ 0. This suggests that the pre-big bang stage is not suitable for generating the present day observable large scale structures, and suggests the importance of investigating the quantum generation processes during stringy era with higher order quantum correction terms.

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