oscillatory universe

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A cosmological model in which the universe has repeated periods of expansion followed by contraction; i.e. a series of big bangs interspersed with big crunches. It was originally put forward in 1922 by the Russian physicist Alexander Friedman (1888–1925). The theory was criticized because it led eventually to an increasing entropy (i.e. heat death). See also ekpyrotic universe.

Subjects: Physics.

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