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Einstein
(1915) and General Relativity, in 1917 uses the
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cosmological
constant to get a static universe solution
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(“Greatest
blunder of my career.”)
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de
Sitter, Friedman, and Lemaitre follow, with more
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solutions
covering a variety of situations, including no
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matter,
closed universes, and expanding universes (and this
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is
all before Hubble found and expanding universe)
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Cosmological
constant was handy, however, for reconciling
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Hubble’s
universe age with the age of Earth, and handy
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today
in reconciling otherwise conflicting data.
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