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Initial conditions and the structure of the singularity in pre-big-bang cosmology

A Feinstein1, K E Kunze2 and M A Vázquez-Mozo3

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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 Kasner-like structure. The analytic relations between the Kasner exponents and the initial data are evaluated explicitly 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.


PACS

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

04.20.Dw Singularities and cosmic censorship

04.30.-w Gravitational waves

MSC

83C35 Gravitational waves

83C75 Space-time singularities, cosmic censorship, etc.

83F05 Cosmology

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 18 (21 September 2000)

Received 10 May 2000



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