The Cyclic Model Simplified

Details The Cyclic Model Simplified The Cyclic Model Simplified

2004-04-24

arxiv.org/abs/astro-ph/0404480v1

New Astron.Rev.49:43-57,2005

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures

Scientific paper

10.1016/j.newar.2005.01.003

The Cyclic Model attempts to resolve the homogeneity, isotropy, and flatness problems and generate a nearly scale-invariant spectrum of fluctuations during a period of slow contraction that precedes a bounce to an expanding phase. Here we describe at a conceptual level the recent developments that have greatly simplified our understanding of the contraction phase and the Cyclic Model overall. The answers to many past questions and criticisms are now understood. In particular, we show that the contraction phase has equation of state w>1 and that contraction with w>1 has a surprisingly similar properties to inflation with w < -1/3. At one stroke, this shows how the model is different from inflation and why it may work just as well as inflation in resolving cosmological problems.

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