A Cyclic Model of the Universe
Abstract
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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We thank M. Bucher, S. Gratton, J. Khoury, B. A. Ovrut, J. Ostriker, P. J. E. Peebles, A. Polyakov, M. Rees, N. Seiberg, D. Spergel, A. Tolley, T. Wiseman, and E. Witten for useful conversations. We thank L. Rocher for pointing out historical references. This work was supported in part by U.S. Department of Energy grant DE-FG02-91ER40671 (P.J.S.) and by PPARC-UK (N.T.).
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Science
Volume 296 | Issue 5572
24 May 2002
24 May 2002
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Received: 1 February 2002
Accepted: 10 April 2002
Published in print: 24 May 2002
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