1997/01/17 by John D. Barrow, Kerstin E. Kunze · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.56.741
published as Phys.Rev. D56 (1997) 741-752 · 25 pages, Latex
arxiv created 1997/01/17 · openalex publication_date 1997/07/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present exact inhomogeneous and anisotropic cosmological solutions of low-energy string theory containing dilaton and axion fields. The spacetime metric possesses cylindrical symmetry. The solutions describe ever-expanding universes with an initial curvature singularity and contain known homogeneous solutions as subcases. The asymptotic form of the solution near the initial singularity has a spatially varying Kasner-like form. The inhomogeneous axion and dilaton fields are found to evolve quasihomogeneously on scales larger than the particle horizon. When the inhomogeneities enter the horizon they oscillate as nonlinear waves and the inhomogeneities attentuate. When the inhomogeneities are small they behave as small perturbations of homogeneous universes. The manifestation of duality and the asymptotic behavior of the solutions are investigated.