The energy of Dirac sea quarks coupled to a SU(2) chiral field, commonly referred to as the Casimir energy, is calculated for a hedgehog shape. The soliton is shown to remain stable with respect to collapse when this energy is included. Derivative expansions are found to be inadequate for discussing stability. © 1985.
Ripka, G., & Kahana, S. (1985). The stability of a chiral soliton in the fermion one-loop approximation. Physics Letters B, 155(5–6), 327–329. https://doi.org/10.1016/0370-2693(85)91580-1