Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Induced Chern-Simons action on noncommutative torus   We compute a Chern-Simons term induced by the fermions on noncommutative
torus interacting with two U(1) gauge fields. For rational noncommutativity
\theta \propto P/Q we find a new mixed term in the action which involves only
those fields which are (2\pi)/Q periodic, like the fields in a crystal with Q^2
nodes.

25
The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg