标题： 关于宇宙泡碰撞可观测性的现状报告 显示英文标题

标题： A status report on the observability of cosmic bubble collisions

摘要： 在由具有多重极小值的标量势驱动的永恒膨胀图景中，我们的可观测宇宙存在于许多从假真空态跃迁形成的气泡中的一个内。这些气泡必然会发生碰撞，破坏我们气泡内部的均匀性和各向同性，并可能在我们气泡的可观测部分留下可检测到的特征，在宇宙微波背景或其他精密宇宙学探测器中可能会观察到这些特征。 这构成了对永恒膨胀和弦理论真空景观的直接实验检验。 评估这种可能性大致可以归结为回答三个问题：典型的气泡碰撞会发生什么？可能会预期到什么样的观测效应？我们观测到一次碰撞的可能性有多大？ 在这篇综述中，我们将报告这些问题目前的研究进展，改进一些现有的结果，并尝试规划未来工作的方向。 显示英文摘要

摘要： In the picture of eternal inflation as driven by a scalar potential with multiple minima, our observable universe resides inside one of many bubbles formed from transitions out of a false vacuum. These bubbles necessarily collide, upsetting the homogeneity and isotropy of our bubble interior, and possibly leading to detectable signatures in the observable portion of our bubble, potentially in the Cosmic Microwave Background or other precision cosmological probes. This constitutes a direct experimental test of eternal inflation and the landscape of string theory vacua. Assessing this possibility roughly splits into answering three questions: What happens in a generic bubble collision? What observational effects might be expected? How likely are we to observe a collision? In this review we report the current progress on each of these questions, improve upon a few of the existing results, and attempt to lay out directions for future work.