Initial Conditions and the Structure of the Singularity in Pre-Big-Bang Cosmology

Details Initial Conditions and the Structure of the Singularity in Pre-Big-Bang Cosmology Initial Conditions and the Structure of the Singularity in Pre-Big-Bang Cosmology

2000-02-09

arxiv.org/abs/hep-th/0002070v2

Class.Quant.Grav. 17 (2000) 3599-3616

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, LaTeX, epsfig. 3 figures included. Minor changes; paragraph added in the introduction, references added and typos co

Scientific paper

10.1088/0264-9381/17/18/301

We propose a picture, within the pre-big-bang approach, in which the universe emerges from a bath of plane gravitational and dilatonic waves. The waves interact gravitationally breaking the exact plane symmetry and lead generically to gravitational collapse resulting in a singularity with the Kasner-like structure. The analytic relations between the Kasner exponents and the initial data are explicitly evaluated and it is shown that pre-big-bang inflation may occur within a dense set of initial data. Finally, we argue that plane waves carry zero gravitational entropy and thus are, from a thermodynamical point of view, good candidates for the universe to emerge from.

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