Revisit of Y-junctions for strings with currents: transonic elastic case

We studied the formation of Y-junctions for transonic elastic strings. In particular, using the gen-eral solution for these strings, which is described by left- and right-moving modes, we obtained thedynamics of kinks and Y-junctions. Considering the linearized ansatz for straight strings, we con-structed the parameter region space for which the formation of Y-junctions due to strings collisionsis allowed.