Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective action for quantum Hall skyrmions   Recently, an O(3) type of effective action was proposed for the quantum Hall
ferromagnet, which accounts for bag formation observed in microscopic Hartree-
Fock calculations. We apply this action in the soliton sector and compare with
Hartree-Fock results. We find good agreement over the whole parameter range
where skyrmions exist. The standard minimal O(3) model cannot explain the bag
and has further shortcomings connected with that fact.

8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th