On the Collision of Cosmic Superstrings

TL;DR

This paper investigates the formation and dynamics of three-string junctions in (p,q)-cosmic superstrings, analyzing collision constraints, junction evolution, and effects of warped geometries like the Klebanov-Strassler throat.

Contribution

It extends collision and junction formation analysis from Nambu-Goto strings to (p,q)-superstrings, including flux conservation and warped space effects.

Findings

Kinematic constraints for superstring collisions are similar to Nambu-Goto strings.

Junction growth or shrinkage rates depend on string parameters.

Warped space modifies junction formation constraints.

Abstract

We study the formation of three-string junctions between (p,q)-cosmic superstrings, and collisions between such strings and show that kinematic constraints analogous to those found previously for collisions of Nambu-Goto strings apply here too, with suitable modifications to take account of the additional requirements of flux conservation. We examine in detail several examples involving collisions between strings with low values of p and q, and also examine the rates of growth or shrinkage of strings at a junction. Finally, we briefly discuss the formation of junctions for strings in a warped space, specifically with a Klebanov-Strassler throat, and show that similar constraints still apply with changes to the parameters taking account of the warping and the background flux.