Gravitational Wave Bursts from Cosmic Superstring Reconnections

Abstract

We compute the gravitational waveform produced by cosmic superstring reconnections. This is done by first constructing the superstring reconnection trajectory, which closely resembles that of classical, instantaneous reconnection but with the singularities smoothed out due to the string path integral. We then evaluate the graviton vertex operator in this background to obtain the burst amplitude. The result is compared to the detection threshold for current and future gravitational wave detectors, finding that neither bursts nor the stochastic background would be detectable by Advanced LIGO. This disappointing but anticipated conclusion holds even for the most optimistic values of the reconnection probability and loop sizes.

26 pages, 6 figures; v2: references added and typos corrected

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• Cosmic Strings and Superstrings
• Gravitational Waves from Broken Cosmic Strings: The Bursts and the Beads
• Cosmic Strings and Cosmic Superstrings
• Covariant Closed String Coherent States
• Proliferation of sharp kinks on cosmic (super-)string loops with junctions
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• Zipping and Unzipping of Cosmic String Loops in Collision
• Cosmological Constraints on the Higgs Boson Mass
• High speed collision and reconnection of Abelian Higgs strings in the deep type-II regime
• Higher order intercommutations in Cosmic String Collisions
• Induced vacuum current and magnetic field in the background of a vortex
• Gravitational power from cosmic string loops with many kinks
• Induced vacuum current and magnetic flux in quantum scalar matter in the background of a vortex defect with the Neumann boundary condition
• Theoretical constraints on brane inflation and cosmic superstring radiation
• Cosmic Strings Collision in Cosmological Backgrounds