Inhomogeneous String Cosmologies

Details Inhomogeneous String Cosmologies Inhomogeneous String Cosmologies

1997-01-17

arxiv.org/abs/hep-th/9701085v1

Phys.Rev. D56 (1997) 741-752

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, Latex

Scientific paper

10.1103/PhysRevD.56.741

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 quasi-homogeneously on scales larger than the particle horizon. When the inhomogeneities enter the horizon they oscillate as non-linear waves and the inhomogeneities attentuate. When the inhomogeneities are small they behave like small perturbations of homogeneous universes. The manifestation of duality and the asymptotic behaviour of the solutions are investigated.

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