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An extension of the Skyrme model is presented in which derivative terms areadded that break chiral symmetry to isospin symmetry. The theory contains justone new parameter and it reduces to the standard Skyrme model when thissymmetry breaking parameter vanishes. The same Faddeev-Bogomolny energy boundapplies for all parameter values, but the parameter can be tuned so that theenergy of the single Skyrmion is much closer to the bound than in the standardSkyrme model. Applying the rational map approximation to multi-Skyrmionssuggests that, for a suitable value of the symmetry breaking parameter, bindingenergies in this theory may be significantly more realistic than in thestandard Skyrme model.

A Skyrme Model with Novel Chiral Symmetry Breaking