Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Periodic orbits in cosmological billiards: the Selberg trace formula for
  asymptotic Bianchi IX universes, evidence for scars in the wavefunction of
  the quantum universe and large-scale structure anisotropies of the present
  universe
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat