Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inhomogeneous M-Theory Cosmologies   We study a class of inhomogeneous and anisotropic $G_2$ string cosmological
models. In the case of separable $G_2$ models we show that the governing
equations reduce to a system of ordinary differential equations. We focus on a
class of separable $G_2$ M-theory cosmological models, and study their
qualitative behaviour (a class of models with time-reversed dynamics is also
possible). We find that generically these inhomogeneous M-theory cosmologies
evolve from a spatially inhomogeneous and negatively curved model with a
non-trivial form field towards spatially flat and spatially homogeneous
dilaton-moduli-vacuum solutions with trivial form--fields. The late time
behaviour is the same as that of spatially homogeneous models previously
studied. However, the inhomogeneities are not dynamically insignificant at
early times in these models.

17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys