Universal Reconnection of Non-Abelian Cosmic Strings
  We show that local/semilocal strings in Abelian/non-Abelian gauge theories with critical couplings always reconnect classically in collision, by using moduli space approximation. The moduli matrix formalism explicitly identifies a well-defined set of the vortex moduli parameters. Our analysis of generic geodesic motion in terms of those shows right-angle scattering in head-on collision of two vortices, which is known to give the reconnection of the strings. 
Minoru Eto, Koji Hashimoto, Giacomo Marmorini, Muneto Nitta, Keisuke   Ohashi and Walter Vinci