Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of dynamical Wilson fermions and the phase structure of compact
  QED_4   By comparison of the quenched and full formulations of compact QED with
Wilson fermions we single out the effects of dynamical fermions on the `chiral
transition line' within the confinement phase. It is shown that this line
cannot correspond to the chiral limit of the theory for all values of the gauge
coupling. This seems to imply the existence of tri-critical points in this
theory, the phase structure of which has a close similarity to QCD at finite
temperature.

2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph