Survival of pq-superstrings in field theory simulations

Abstract

We perform large-scale field theoretical simulations in expanding universe to characterize a network of strings that can form composed bound states. The network consists of two copies of Abelian Higgs strings (which we label p and q, respectively) coupled via a potential term to give pq bound states. The simulations are performed using two different kinds of initial conditions: the first one with a network of p- and q-strings, and the second one with a network of q- and pq-strings. This way, we start from two opposite situations: one with no initial pq-strings, and one with a large initial number of pq-strings. We find that in both cases the system scales, and in both cases the system prefers to have a low fraction of pq-strings. This is somewhat surprising in the case for the second type of conditions, showing that the unzipping mechanism is very efficient. We also find hints that both initial conditions tend to asymptote to a common configuration, though we would need a larger dynamical range to confirm it. The average velocities of the different types of strings in the network have also been explored for the first time.

23 pages, 12 figures; matches published version

References in corpus (6)

• CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
• Scaling from gauge and scalar radiation in Abelian Higgs string networks
• Evolution of cosmic superstring networks: a numerical simulation
• Numerical experiments with p F- and q D-strings: the formation of (p,q) bound states
• Scaling in a SU(2)/Z_3 model of cosmic superstring networks
• Zipping and Unzipping in String Networks: Dynamics of Y-junctions

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• Gravitational Wave Bursts from Cosmic String Cusps and Pseudocusps
• Abelian-Higgs Cosmic String Evolution with CUDA
• Dynamics of junctions and the multi-tension velocity-dependent one-scale model
• Scaling in necklaces of monopoles and semipoles
• Multitension strings in high-resolution U(1)$\times$U(1) simulations