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We study, within the Nambu-Goto approximation, the stability of massivestring junctions under the influence of the tensions of three strings joiningtogether in a Y-type configuration. The relative angle $\beta$ between thestrings at the junction is in general time-dependent and its evolution can leadto zipping or unzipping of the three-string configuration. We find that theseconfigurations are stable under deformations of the tension balance conditionat the junction. The angle $\beta$ relaxes at its equilibrium value and thejunction grows relativistically. We then discuss other potential "unzippingagents" including monopole/string forces for long strings and curvature forloops, and we investigate specific solutions exhibiting decelerated zipping andunzipping of the Y-junction. These results provide motivation for incorporatingthe effects of realistic string interactions in network evolution models withstring junctions.

Zipping and Unzipping in String Networks: Dynamics of Y-junctions