Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Schwinger mechanism in QCD   The generation of a momentum-dependent gluon mass proceeds through a
sophisticated implementation, at the level of the Schwinger-Dyson equation for
the gluon propagator, of the Schwinger mechanism, whose central dynamical
ingredient is the nonperturbative formation of longitudinally coupled massless
bound-state excitations. In addition to triggering the aforementioned
mechanism, these excitations introduce poles in the various off-shell Green's
functions of the theory, in such a way as to maintain the Slavnov-Taylor
identities intact in the presence of massive gluon propagators, acting
effectively as composite Nambu-Goldstone bosons. In this work we focus on the
dynamics leading to the actual formation of such bound states. Specifically, we
derive and solve numerically an approximate version of the homogeneous
Bethe-Salpeter equation governing the wave function of this special bound
state. It is found that this integral equation admits physically meaningful
non-trivial solutions, indicating that the QCD dynamics produce one of the
crucial ingredients required for the gauge-invariant generation of a gluon
mass.

14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs