论文标题
三个小悖论：使半经典重力有意义
Three little paradoxes: making sense of semiclassical gravity
论文作者
论文摘要
我回顾了最常反对古典时空与量子问题的基本耦合所提出的论点。我表明，逐页和吉尔克（Geilker）的实验并不排除这种半经典理论，而是要求包含波函数崩溃的客观机制。在这方面，我提出了通过引入波函数崩溃的方式定义的半经典模型的分类。在量化重力场的必要性中已经讨论过的两种相关类型的悖论可以证明不会限制半经典耦合的可能性。如果通过相关的波函数塌陷机制满足某些条件，则可以明显地避免使用第三个悖论，这是通过半经典重力来快速发信号的可能性。总之，所有当前讨论的半经典重力模型都可以与观察一致。他们的内部理论一致性仍然是一个悬而未决的问题。
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.
