We show that the stability of the electroweak Z-string is greatly improved by the presence of bound states of a complex scalar field. This stabilization mechanism could work for other embedded defects and also for unstable solutions such as the sphaleron. © 1993.
Vachaspati, T., & Watkins, R. (1993). Bound states can stabilize electroweak strings. Physics Letters B, 318(1), 163–168. https://doi.org/10.1016/0370-2693(93)91800-3