Turns out Einstein returned to considering his disgraced cosmological constant lambda later in his life.
. But it was not. It seems that even with Einstein, old notions die hard: This paper was his stubborn attempt to resurrect the cosmological constant he had vowed never to use again.just filed on the electronic physics repository ArXiv, O’Raifeartaigh and colleagues show that in the early 1930s , Einstein was still trying to return to his 1917 analysis of a universe with a cosmological constant. Einstein wrote :also arises in the general theory of relativity.
So Einstein keeps on using his discarded lambda — despite the fact that he invented it for a non-expanding universe. If the universe expands as Hubble showed, Einstein seems to be saying, then I still need my lambda — now to keep the universe from becoming less dense as it expands in volume.
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