Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of Computer Generated Gravitational Waves in Numerical
  Cosmologies   We propose to study the behavior of complicated numerical solutions to
Einstein's equations for generic cosmologies by following the geodesic motion
of a swarm of test particles. As an example, we consider a cylinder of test
particles initially at rest in the plane symmetric Gowdy universe on $T^3
\times R$. For a circle of test particles in the symmetry plane, the geodesic
equations predict evolution of the circle into distortions and rotations of an
ellipse as well as motion perpendicular to the plane. The evolutionary sequence
of ellipses depends on the initial position of the circle of particles. We
display snapshots of the evolution of the cylinder.

28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
3
The categories of this paper are: physics