On the Classical Stability of Orientifold Cosmologies

Details On the Classical Stability of Orientifold Cosmologies On the Classical Stability of Orientifold Cosmologies

2003-02-18

arxiv.org/abs/hep-th/0302137v2

Class.Quant.Grav. 20 (2003) 3969-3996

Physics

High Energy Physics

High Energy Physics - Theory

40 pages, 13 figures. Reference and conclusion added. Published version

Scientific paper

10.1088/0264-9381/20/18/309

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.

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