Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instanton effects and chiral symmetry breaking in QCD2   We discuss the spontaneous breakdown of chiral symmetry in Quantum
Chromodynamics by considering gluonic instanton configurations in the partition
function. It is shown that in order to obtain nontrivial fermionic correlators
in a two dimensional gauge theory for the strong interactions among quarks, a
regular instanton background has to be taken into account. We work over
massless quarks in the -fundamental- representation of SU(N_c). For large N_c,
massive quarks are also considered.

9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th