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> Einstein did not himself believe that black holes really exist

Wow.

Einstein did not believe in gravitational waves either.

He also famously added the cosmological constant because he didn't like the idea of an expanding universe.

Do you have a source for this? I thought they were a direct prediction of GR and this link says the same: https://www.ligo.caltech.edu/page/what-are-gw

You can read about it in Abraham Pais' scientific biography of Einstein, _Subtle is the Lord_.

I don't have a copy of that book, but the abstract of this paper from 1937, co-authored by Einstein, claims that gravitational waves are a prediction of GR: https://www.sciencedirect.com/science/article/abs/pii/S00160...