Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure of Multi-Meron Knot Action   We consider the structure of multi-meron knot action in the Yang-Mills theory
and in the CP^1 Ginzburg-Landau model. Self-dual equations have been obtained
without identifying orientations in the space-time and in the color space. The
dependence of the energy bounds on topological parameters of coherent states in
planar systems is also discussed. In particular, it is shown that a
characteristic size of a knot in the Faddeev-Niemi model is determined by the
Hopf invariant.

2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs