Approximate analytical solutions of the baby Skyrme model

In present paper we show that many properties of the baby skyrmions, which have been determined numerically, can be understood in terms of an analytic approximation. In particular, we show that this approximation captures properties of the multiskyrmion solutions (derived numerically) such as their stability towards decay into various channels, and that it is more accurate for the new baby Skyrme model which describes anisotropic physical systems in terms of multiskyrmion fields with axial symmetry. Some universal characteristics of configurations of this kind are demonstrated, which do not depend on their topological number.

Skyrmion
sigma model: nonlinear
symmetry: O(3)
energy: density
perturbation theory
numerical calculations

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