Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Fermions and the Standard Model from the Matrix Model
  Compactified on a Torus   It is shown that the IIB matrix model compactified on a six-dimensional torus
with a nontrivial topology can provide chiral fermions and matter content close
to the standard model on our four-dimensional spacetime. In particular,
generation number three is given by the Dirac index on the torus.

9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex