Heard he wrote a bunch of rambling thoughts near the end of his life and doubted his own theory of relativity...it was in Einstein: His Life and Universe by Walter Isaacson

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    $\begingroup$ Where have you heard it, and what exactly did Isaacson write? I looked through the last two chapters of his book, but did not find anything like that. $\endgroup$ – Conifold May 29 '19 at 21:28
  • $\begingroup$ Maybe this refers to the "cosmological constant" ... which Einstein later called his "biggest blunder". $\endgroup$ – Gerald Edgar May 30 '19 at 0:03
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    $\begingroup$ Hi, when asking questions, please replace "I've heard" with a citation link so we can evaluate the source $\endgroup$ – Carl Witthoft May 30 '19 at 12:38
  • $\begingroup$ @GeraldEdgar I doubt it. He renounced the cosmological constant from 1931 onward, not in the last years, and never returned to it, see Investigating the legend of Einstein’s “biggest blunder”. $\endgroup$ – Conifold May 31 '19 at 8:10


He opposed Quantum Mechanics from the beginning until death. He did it because its inherent non-determinism ("God does not gamble"). In his opinion, the cause of the non-determinism of the QM is that "it is not ready".

However, he worked on the further development of the GR until death. A possible direction was to describe also the electromagnetism as spacetime curvature. This makes highly unlikely that he had doubted it.


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