真空与半经典引力：一个难题及其令人困惑的意义
Vacuum and semiclassical gravity: a difficulty and its bewildering significance
摘要：
我们回顾了真空和真空衰变的一些半经典模型中的一个长期存在的困难。令人惊讶的是，这些模型，不小心他们的透明配方，受到影响，无论是技术和概念问题。在证明了一些与其动力学的欧几里得和洛伦兹部分相关的一般结果之后，我们简要地强调了它们与之前讨论的问题有关的重要性，认为它们的解决方案可能对我们寻求量子引力很有意义。
英文摘要：
We review a long-standing difficulty in some semiclassical models of vacuum and vacuum decay. Surprisingly enough these models, careless of their transparent formulation, are affected by, both, technical and conceptual issues. After proving some general results that are relevant for, both, the Euclidean and Lorentzian sectors of their dynamics, we briefly highlight their importance in connection with the issues discussed before, arguing that their solution might be interesting in our quest for quantum gravity.
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