From Sabine Hossenfelder.

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Physicists are obsessed with black holes, but we still don’t know what’s going on inside of them. One idea is that black holes do not truly exist, but instead they are big quantum objects that have been called fuzzballs or frozen stars. This idea has a big problem. Let’s take a look.

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Paper: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.110.024066

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