标题： 陈-西蒙斯气泡：轴子电动力学中的偏斜假真空衰变 显示英文标题

标题： Chern-Simons bubbles: Lopsided false vacuum decay in axion electrodynamics

摘要： 我们研究了轴子电动力学，包括Chern-Simons相互作用项，在平行背景电场和磁场存在的条件下，这可以在某些轴子暴胀模型以及磁单极黑洞的研究中出现。 在这种设定下，我们发现了一种新的反作用瞬子解，它对应于轴子畴壁的成核，该畴壁屏蔽电磁场的过程类似于Schwinger成对产生，尽管不存在轻带电粒子。 完整解包括由Witten和Sikivie（异常霍尔）效应分别引起的Chern-Simons诱导电荷和电流对轴子畴壁的影响。 欧几里得解具有减少的$O(2)\times O(2)$对称性，描述了在其静止参考系中一个拉长泡的成核。 该解的独特之处在于能量密度较低的区域位于气泡外部而非内部。 我们还描述了这一初始构型的时间演化，展示了气泡如何沿背景电场和磁场方向进一步拉长。 我们描述了这一过程在粒子物理和宇宙学中的潜在应用。 显示英文摘要

摘要： We study axion electrodynamics, including the Chern-Simons interaction term, in the presence of parallel background electric and magnetic fields, as can for example occur in certain models of axion inflation and in the study of dyonic black holes. In this setup, we find a new back-reacted instanton solution which corresponds to the nucleation of an axion domain wall that screens the electromagnetic fields in a process analogous to Schwinger pair production, despite the absence of light charged particles. The full solution includes the effect of the Chern-Simons induced charges and currents on the axion domain wall arising from the Witten and Sikivie (anomalous Hall) effects, respectively. The Euclidean solution has a reduced $O(2)\times O(2)$ symmetry which describes the nucleation of a prolate bubble in its rest-frame. A unique feature of this solution is that the region of lower energy density is outside the bubble rather than inside. We also describe the time evolution of this initial configuration, showing how the bubble can become further elongated along the direction of the background electric and magnetic fields. We describe potential applications of this process in particle physics and cosmology.