Zipping and Unzipping of Cosmic String Loops in Collision

Abstract

In this paper the collision of two cosmic string loops is studied. After collision junctions are formed and the loops are entangled. We show that after their formation the junctions start to unzip and the loops disentangle. This analysis provides a theoretical understanding of the unzipping effect observed in numerical simulations of a network of cosmic strings with more than one type of cosmic strings. The unzipping phenomena have important effects in the evolution of cosmic string networks when junctions are formed upon collision, such as in a network of cosmic superstrings.

arXiv commentreferences added, typos corrected, PRD version

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• Seeking String Theory in the Cosmos
• Probing Cosmic Superstrings with Gravitational Waves
• Gravitational wave signatures from kink proliferation on cosmic (super-) strings
• String Vertex Operators and Cosmic Strings
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• Cosmic superstring trajectories in warped compactifications
• Cosmic Strings Collision in Cosmological Backgrounds
• Can Superconducting Cosmic Strings Piercing Seed Black Holes Generate Supermassive Black Holes in the Early Universe?