On the Classical Stability of Orientifold Cosmologies

Abstract

We analyze the classical stability of string cosmologies driven by the dynamics of orientifold planes. These models are related to time-dependent orbifolds, and resolve the orbifold singularities which are otherwise problematic by introducing orientifold planes. In particular, we show that the instability discussed by Horowitz and Polchinski for pure orbifold models is resolved by the presence of the orientifolds. Moreover, we discuss the issue of stability of the cosmological Cauchy horizon, and we show that it is stable to small perturbations due to in-falling matter.

arXiv comment40 pages, 13 figures. Reference and conclusion added. Published version

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• Towards a Resolution of the Cosmological Singularity in Non-local Higher Derivative Theories of Gravity
• Time-dependent Orbifolds and String Cosmology
• Cosmological Perturbations in a Big Crunch/Big Bang Space-time
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• Shift Symmetry and Inflation in Supergravity
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• Cosmological anti-deSitter space-times and time-dependent AdS/CFT correspondence
• Integrability of Supergravity Billiards and the generalized Toda lattice equation
• Hagedorn transition and chronology protection in string theory
• Cosmic Billiards with Painted Walls in Non-Maximal Supergravities: a worked out example
• On Bouncing Brane-Worlds, S-branes and Branonium Cosmology
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• Colliding $p$-branes in the dynamical intersecting brane system