论文标题
真空度半经典重力不会为安全的奇异性留出空间
Vacuum semiclassical gravity does not leave space for safe singularities
论文作者
论文摘要
一般相对论可以预测其自身的奇异性灭亡，但似乎也可以方便地保护自己免受这种奇异性的灾难性后果，从而使其安全。例如，如果最终满足了强大的宇宙审查制度，那么时空的奇异性（尽管存在）不会对可预测性构成任何实际问题。在这里，我们认为，在半经典效应下，情况应该大不相同：理论中可能出现的潜在奇异性将普遍影响可预测性，因此将被迫分析是否有一种正规化它们的方法。对于这些可能的正规化，重力崩溃和稳定为新结构中物质的存在和行为将发挥关键作用。首先，我们证明静态的半经典式对应物与Schwarzschild和Reissner-Nordström的几何形状具有不再隐藏在地平线后面的奇异性。然后我们认为，在黑洞的形成和蒸发的动态场景中，我们只剩下三个可能的结果，可以避免奇异性和最终可预测性问题。我们简要分析了它们在半经典重力中的生存能力，并讨论其进化的预期特征时间标准。
General relativity predicts its own demise at singularities, but also appears to conveniently shield itself from the catastrophic consequences of such singularities, making them safe. For instance, if strong cosmic censorship were ultimately satisfied, spacetime singularities, although present, would not pose any practical problems to predictability. Here we argue that under semiclassical effects the situation should be rather different: the potential singularities which could appear in the theory will generically affect predictability and so one will be forced to analyse whether there is a way to regularise them. For these possible regularisations, the presence and behaviour of matter during gravitational collapse and stabilisation into new structures will play a key role. First we show that the static semiclassical counterparts to the Schwarzschild and Reissner-Nordström geometries have singularities which are no longer hidden behind horizons. Then we argue that in dynamical scenarios of formation and evaporation of black holes, we are left with only three possible outcomes which could avoid singularities and eventual predictability issues. We briefly analyse the viability of each one of them within semiclassical gravity, and discuss the expected characteristic timescales of their evolution.
