Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Networks of cosmological histories, crossing of the phantom divide line
  and potentials with cusps   We discuss the phenomenon of the smooth dynamical gravity induced crossing of
the phantom divide line in a framework of simple cosmological models where it
appears to occur rather naturally, provided the potential of the unique scalar
field has some kind of cusp. The behavior of cosmological trajectories in the
vicinity of the cusp is studied in some detail and a simple mechanical analogy
is presented. The phenomenon of certain complementarity between the smoothness
of the spacetime geometry and matter equations of motion is elucidated. We
introduce a network of cosmological histories and qualitatively describe some
of its properties.

9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom