Asymptotic states of the bounce geometry

Details Asymptotic states of the bounce geometry Asymptotic states of the bounce geometry

2005-11-08

arxiv.org/abs/hep-th/0511084v2

Phys.Rev. D73 (2006) 083507

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, 7 figures. v2: reference added

Scientific paper

10.1103/PhysRevD.73.083507

We consider the question of asymptotic observables in cosmology. We assume that string theory contains a landscape of vacua, and that metastable de Sitter regions can decay to zero cosmological constant by bubble nucleation. The asymptotic properties of the corresponding bounce solution should be incorporated in a nonperturbative quantum theory of cosmology. A recent proposal for such a framework defines an S-matrix between the past and future boundaries of the bounce. We analyze in detail the properties of asymptotic states in this proposal, finding that generic small perturbations of the initial state cause a global crunch. We conclude that late-time amplitudes should be computed directly. This would require a string theory analogue of the no-boundary proposal.

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