2003/02/28 by Lorenzo Cornalba, L. Cornalba, M. S. Costa +1 · 33 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Gravitational singularity #Noncommutative and Quantum Gravity Theories #Orbifold #Orientifold #Stability (learning theory) #String (physics) #String theory #gr-qc #hep-th
paper · pdf · doi:10.1088/0264-9381/20/18/309
published in Classical and Quantum Gravity 20(18), 3969-3995 (IOP Publishing) · 40 pages, 13 figures. Reference and conclusion added. Published version
arxiv created 2003/07/03 · openalex publication_date 2003/08/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We analyse 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.