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Zipping and unzipping in string networks: dynamics of Y-junctions

Avgoustidis, Anastasios; Pourtsidou, Alkistis; Sakellariadou, Mairi


Alkistis Pourtsidou

Mairi Sakellariadou


We study, within the Nambu-Goto approximation, the stability of massive string junctions under the influence of the tensions of three strings joining together in a Y-type configuration. The relative angle β between the strings at the junction is in general time dependent and its evolution can lead to zipping or unzipping of the three-string configuration. We find that these configurations are stable under deformations of the tension balance condition at the junction. The angle β relaxes at its equilibrium value and the junction grows relativistically. We then discuss other potential “unzipping agents” including monopole/string forces for long strings and curvature for loops, and we investigate specific solutions exhibiting decelerated zipping and unzipping of the Y junction. These results provide motivation for incorporating the effects of realistic string interactions in network evolution models with string junctions.


Avgoustidis, A., Pourtsidou, A., & Sakellariadou, M. (2015). Zipping and unzipping in string networks: dynamics of Y-junctions. Physical Review D, 91(2), Article 025022.

Journal Article Type Article
Publication Date Jan 15, 2015
Deposit Date Sep 29, 2015
Publicly Available Date Sep 29, 2015
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 1550-7998
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 91
Issue 2
Article Number 025022
Keywords cosmic strings, string theory, string junctions
Public URL
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