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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?

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    $\begingroup$ Note that Einstein died before any of the now-standard cosmological datasets were gathered, depriving him of a ton of knowledge! $\endgroup$
    – Danu
    Commented Sep 2, 2014 at 13:08
  • $\begingroup$ As a note, Einstein apparently said this in 1939. Back then, we were somewhat lacking in the experimental search (or lack of it) for black holes! $\endgroup$
    – HDE 226868
    Commented Sep 2, 2014 at 13:12
  • $\begingroup$ There is also another good paper: arxiv.org/abs/1101.0601 $\endgroup$
    – user55867
    Commented Sep 2, 2014 at 13:38
  • $\begingroup$ The preprint you cite seems to display some basic misunderstandings about GR $\endgroup$
    – Holographer
    Commented Sep 2, 2014 at 14:26
  • $\begingroup$ What misunderstandings?, however This is not the only paper, look at Abhas Mitra paper on the subject, he has also supported the preprint that i cited in his numerous works, also look at this, this also would be a good discussion, $\endgroup$
    – user55867
    Commented Sep 2, 2014 at 14:38

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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.

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    $\begingroup$ Here is a good discussion about singularity theorems, i guess Abhas Mitra has answered the issues regarding the singularity theorems, just look at his numerous papers on arxiv about this subject, also check his wiki page $\endgroup$
    – user55867
    Commented Sep 2, 2014 at 14:28
  • $\begingroup$ It seems that everyone thinks inside the mainstream Black Hole research, okee dokee ... maybe because it is the right path ... or maybe ... $\endgroup$
    – user55867
    Commented Sep 4, 2014 at 5:47

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