Turnaround in Cyclic Cosmology

Details Turnaround in Cyclic Cosmology Turnaround in Cyclic Cosmology

2006-10-18

arxiv.org/abs/hep-th/0610213v2

Phys.Rev.Lett.98:071301,2007

Physics

High Energy Physics

High Energy Physics - Theory

8 pages latex. Changes in wording. Discussion of radiation

Scientific paper

10.1103/PhysRevLett.98.071301

It is speculated how dark energy in a brane world can help reconcile an infinitely cyclic cosmology with the second law of thermodynamics. A cyclic cosmology is described, in which dark energy leads to a turnaround at a time, extremely shortly before the would-be Big Rip, at which both volume and entropy of our universe decrease by a gigantic factor, while very many independent similarly small contracting universes are spawned. The entropy of our universe decreases almost to zero at turnaround but increases for the remainder of the cycle by a vanishingly small amount during contraction, empty of matter, then by a large factor during inflationary expansion.

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