Al. Larsen et Nk. Nielsen, NONCOLLAPSING CIRCULAR STRING WITH WORLD-SHEET SPINORS, Physical review. D. Particles and fields, 48(4), 1993, pp. 1748-1756
We construct a noncollapsing circular string configuration in D dimens
ional spacetime, by introducing spinors on the world sheet. Our constr
uction allows the presence of both a U(1) and an SU(2) current. In the
latter case the role of the Wess-Zumino-Witten term for the bosonizat
ion procedure is investigated.