Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Structure in the SU(2) Vacuum   We study the topological content of the vacuum of SU(2) pure gauge theory
using lattice simulations. We use a smoothing process based on the
renormalization group equation which removes short distance fluctuations but
preserves long distance structure. The action of the smoothed configurations is
dominated by instantons, but they still show an area law for Wilson loops with
a string tension equal to the string tension on the original configurations.
Yet it appears that instantons are not directly responsible for confinement.
The average radius of an instanton is about 0.2 fm, at a density of about 2
fm^(-4). This is a much smaller average size than other lattice studies have
indicated. The instantons appear not to be randomly distributed in space, but
are clustered.

24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics