Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reading between the lines of four-dimensional gauge theories   Starting with a choice of a gauge group in four dimensions, there is often
freedom in the choice of magnetic and dyonic line operators. Different
consistent choices of these operators correspond to distinct physical theories,
with the same correlation functions of local operators in R^4. In some cases
these choices are permuted by shifting the theta-angle by 2pi. In other cases
they are labeled by new discrete theta-like parameters. Using this
understanding we gain new insight into the dynamics of four-dimensional gauge
theories and their phases. The existence of these distinct theories clarifies a
number of issues in electric/magnetic dualities of supersymmetric gauge
theories, both for the conformal N=4 theories and for the low-energy dualities
of N=1 theories.

27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph