三个小悖论：理解半经典引力
Three little paradoxes: making sense of semiclassical gravity
摘要：
我回顾了最常提出的反对经典时空与量子物质的基本耦合的论点。我表明，佩奇和盖尔克的实验并不排除这样的半经典理论，但要求列入一个客观的机制波函数崩溃。在这方面，我提出了一个分类的半经典模型定义的方式，其中波函数崩溃介绍。在讨论引力场非线性的必要性时，已经讨论过的两种相关类型的佯谬，可以证明不限制半经典耦合的可能性。第三个悖论是，如果相关的波函数坍缩机制满足某些条件，则可以避免通过半经典引力发出比光速更快的信号的可能性。总之，目前讨论的所有半经典引力模型都可以与观测相一致。其内在的理论一致性仍然是一个悬而未决的问题。
英文摘要：
I review the arguments most often raised against a fundamental coupling of classical spacetime to quantum matter. I show that an experiment by Page and Geilker does not exclude such a semiclassical theory but mandates an inclusion of an objective mechanism for wave function collapse. In this regard, I present a classification of semiclassical models defined by the way in which the wave function collapse is introduced. Two related types of paradoxes that have been discussed in the context of the necessity to quantize the gravitational field can be shown to not constrain the possibility of a semiclassical coupling. A third paradox, the possibility to signal faster than light via semiclassical gravity, is demonstrably avoided if certain conditions are met by the associated wave function collapse mechanism. In conclusion, all currently discussed models of semiclassical gravity can be made consistent with observation. Their internal theoretical consistency remains an open question.
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