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Parametric resonances in axionic cosmic strings
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DOI：10.1088/1475-7516/2023/04/043.png)
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摘要
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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 reso-nantly 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.
Keyword:
Cosmic strings
domain walls
monopoles
axions
期刊
IF:
5.9
论文数:
1.3W
被引数:
4.7W
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