We consider the quantum dynamics of gravitational collapse in a model in which the wave function spreads out over a large ensemble of geometries as envisioned in the fuzzball proposal. We show that the probabilities of coarse-grained observables are highly peaked around the classical black hole values. By contrast, probabilities for finer-grained observables probing the neighbourhood of collapsed objects are more broadly distributed and no notion of ‘averaging’ applies to them. This implies that the formation of fuzzballs gives rise to distinct observational signatures that are more significant than has hitherto been thought and may be tested against observations in the near future. We also predict a novel kind of gravitational wave burst associated with the spreading of the wave function in gravitational collapse.

中文翻译：

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模糊球形成的观察意义

我们在一个模型中考虑引力坍缩的量子动力学，其中波函数散布在模糊球提案中设想的大型几何集合上。我们表明，粗粒度观测值的概率在经典黑洞值附近高度峰值。相比之下，探测倒塌物体邻域的细粒度可观测值的概率分布更广泛，并且没有“平均”的概念适用于它们。这意味着模糊球的形成会产生明显的观察特征，这些特征比迄今为止认为的更重要，并且可能在不久的将来针对观察进行测试。我们还预测了一种与引力坍缩中波函数的传播相关的新型引力波爆发。