Pk. Ghosh et Sk. Ghosh, TOPOLOGICAL AND NONTOPOLOGICAL SOLITONS IN A GAUGED O(3) SIGMA-MODEL WITH CHEM-SIMONS TERM, Physics letters. Section B, 366(1-4), 1996, pp. 199-204
The O(3) nonlinear sigma model with its U(1) subgroup gauged, where th
e gauge field dynamics is solely governed by a Chern-Simons term, admi
ts both topological as well as nontopological sell-dual soliton soluti
ons for a specific choice of the potential. It turns out that the topo
logical solitons are infinitely degenerate in any given sector.