High speed collision and reconnection of Abelian Higgs strings in the deep type-II regime

Abstract

We study high speed collision and reconnection of cosmic strings in the type-II regime (scalar-to-gauge mass ratios larger than one) of the Abelian Higgs model. New phenomena such as multiple reconnections and clustering of small scale structure have been observed and reported in a previous paper, as well as the fact that the previously observed loop that mediates the second intercommutation is only a loop for sufficiently large beta = m_scalar^2/m_gauge^2. Here we give a more detailed account of our study, involving 3D numerical simulations with beta in the range 1 to 64, the largest value simulated to date, as well as 2D simulations of vortex-antivortex (v-av) collisions to understand the possible relation to the new 3D phenomena. Our simulations give further support to the idea that Abelian Higgs strings never pass through each other, unless this is the result of a double reconnection; and that the critical velocity (v_c) for double reconnection goes down with increasing mass ratio, but energy conservation suggests a lower bound around 0.77c. We discuss the qualitative change in the intermediate state observed for large mass ratios. We relate it to a similar change in the outcome of 2D v-av collisions in the form of radiating bound states. In the deep type-II regime the angular dependence of v_c for double reconnection does not seem to conform to semi-analytic predictions based on the Nambu-Goto approximation. We model the high angle collisions reasonably well by incorporating the effect of core interactions, and the torque they produce on the approaching strings, into the Nambu-Goto description of the collision. An interesting, counterintuitive aspect is that the effective collision angle is smaller because of the torque. Our results suggest differences in network evolution and radiation output with respect to the predictions based on Nambu-Goto or beta = 1 Abelian Higgs dynamics.

13 pages, 7 figures Send For Publication in Physics Review D

References in corpus (10)

• Universal Reconnection of Non-Abelian Cosmic Strings
• Seeking String Theory in the Cosmos
• Analytic Study of Small Scale Structure on Cosmic Strings
• Constraints on string networks with junctions
• How to Run Through Walls: Dynamics of Bubble and Soliton Collisions
• Cosmic Strings and Cosmic Superstrings
• Kinematic Constraints on Formation of Bound States of Cosmic Strings - Field Theoretical Approach
• Effective non-intercommutation of local cosmic strings at high collision speeds
• Gravitational Wave Bursts from Cosmic Superstring Reconnections
• Higher order intercommutations in Cosmic String Collisions

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• Evolution of Semilocal String Networks: I. Large-scale Properties
• A window for cosmic strings
• Correlations between cosmic strings and extra relativistic species
• Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review