Research Article

A Cyclic Model of the Universe

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Science  24 May 2002:
Vol. 296, Issue 5572, pp. 1436-1439
DOI: 10.1126/science.1070462

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We propose a cosmological model in which the universe undergoes an endless sequence of cosmic epochs that begin with a “bang” and end in a “crunch.” Temperature and density at the transition remain finite. Instead of having an inflationary epoch, each cycle includes a period of slow accelerated expansion (as recently observed) followed by contraction that produces the homogeneity, flatness, and energy needed to begin the next cycle.

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