The advent of gravitational waves and black hole imaging has opened a new window into probing the horizon scale of black holes. An important question is whether string theory results for black holes can predict interesting and observable features that current and future experiments can probe. In this article I review the budding and exciting research being done on understanding the possibilities of observing signals from fuzzballs, where black holes are replaced by string-theoretic horizon-scale microstructure. In order to be accessible to both string theorists and black hole phenomenologists, I give a brief overview of the relevant observational experiments as well as the fuzzball paradigm in string theory and its explicitly constructable solutions called microstate geometries.

中文翻译：

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模糊球和观察

引力波和黑洞成像的出现为探索黑洞视界尺度打开了一扇新窗口。一个重要的问题是，黑洞的弦理论结果是否可以预测当前和未来实验可以探测的有趣和可观察的特征。在这篇文章中，我回顾了在理解观察来自模糊球的信号的可能性方面正在进行的新兴和令人兴奋的研究，其中黑洞被弦理论视界尺度微观结构所取代。为了让弦理论家和黑洞现象学家都能理解，我简要概述了相关的观察实验以及弦理论中的模糊球范式及其明确可构造的解决方案，称为微态几何。