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I have seen some papers claiming that Einstein said there is no Black Hole in the real world, here is a phrase from Einstein himself, see this arXiv preprint:

The basic result of study is the distinct understanding that there are no Schwarzschild singularities in the real world. Thought the offered theory considers only such systems, in which particles move by circle trajectories, we have to hardly doubt that the investigation of generic case will lead to the same results. The Schwarzschild singularity is absent, because the matter cannot concentrated in an arbitrary way;otherwise particles composing the clump will reach the speed of light.

Why did Einstein say the particles composing the clump will reach the speed of light? And why haven't other physicists accepted his argument?

Qmechanic
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Understandably, Einstein would probably have been uncomfortable with the idea of singularities being consequences of GR. Your quote seems to indicate that he thought the singularity of a Schwarzschild solution was an accident caused by exact spherically symmetry, and that a more generic configuration would somehow not result in a singularity at all. However, his arguments are no more that heuristics and intuition. In such extreme circumstances, anyone's intuition is likely to be challenged. In the end you have to do the work to find out the real consequences of the theory!

The status of this was made clear when it was later proved by Hawking and Penrose that in some quite general circumstances, formation of a singularity is in fact completely inevitable in classical GR and related theories. (Read more at Hawking-Penrose singularity theorems).

Any denial of the formation of singularities must make some modification to the assumptions of the proof: some exotic matter, for example.

Holographer
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