Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon mass via current confinement   A parity invariant theory, consisting of two massive Dirac fields, defined in
three dimensional space-time, with the confinement of a certain current is
studied. It is found that the electromagnetic field, when coupled minimally to
these Dirac fields, becomes massive owing to the current confinement. It is
seen that the origin of photon mass is not due to any kind of spontaneous
symmetry breaking, but only due to current confinement.

3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol