Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inhomogeneous String Cosmologies   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.

37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math