论文标题
轴离宇宙字符串中的参数共振
Parametric Resonances in Axionic Cosmic Strings
论文作者
论文摘要
在这封信中，我们发现了轴离宇宙字符串的新参数共振。此过程是由内部模式激发字符串上的存在触发的，这些激发串在串联的弦上增强了字符串的横向位移的幅度。我们通过运行数值模拟来研究这一过程，该数值模拟证明了这种现象在$（3+1）$尺寸晶格场理论中的存在，并将结果与对这些模式振幅有效的Lagrangian的分析期望进行比较。最后，我们还分析了这些激发字符串产生的无质量和巨大辐射，并评论了它与解释轴基宇宙弦网络当前数值模拟结果的相关性。
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.
