Parametric Resonances in Axionic Cosmic Strings

In this letter we uncover a new parametric resonance of axionic cosmic strings. This process is triggered by the presence on the string of internal mode excitations that resonantly amplify the amplitude of transverse displacements of the string. We study this process by running numerical simulations...

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Bibliographic Details
Published in:arXiv.org 2023-04
Main Authors: Blanco-Pillado, Jose J, Jiménez-Aguilar, Daniel, Queiruga, Jose M, Urrestilla, Jon
Format: Article
Language:English
Subjects:
Amplitudes
Field theory
Lattice vibration
Strings
Online Access:Get full text
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Summary:In this letter we uncover a new parametric resonance of axionic cosmic strings. This process is triggered by the presence on the string of internal mode excitations that resonantly amplify the amplitude of transverse displacements of the string. We study this process by running numerical simulations that demonstrate the existence of this phenomenon in a \((3+1)\) dimensional lattice field theory and compare the results with the analytic expectations for the effective Lagrangian of the amplitude of these modes and their interactions. Finally, we also analyze the massless and massive radiation produced by these excited strings and comment on its relevance for the interpretation of the results of current numerical simulations of axionic cosmic string networks.
ISSN:2331-8422
DOI:10.48550/arxiv.2212.06194