Hopf Soliton Solutions from Low Energy Effective Action of SU(2) Yang-Mills Theory

N. Sawado, N. Shiiki, S. Tanaka

The Skyrme-Faddeev-Niemi (SFN) model which is an O(3) $\sigma$ model in three dimensional space up to fourth-order in the first derivative is regarded as a low-energy effective theory o…