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Designing Cyclic Universe Models

2004; American Physical Society; Volume: 92; Issue: 3 Linguagem: Inglês

10.1103/physrevlett.92.031302

1092-0145

Justin Khoury, Paul J. Steinhardt, Neil Turok,

Geophysics and Gravity Measurements

The phenomenological constraints on the scalar field potential in cyclic models of the Universe are presented. We show that cyclic models require a comparable degree of tuning to that needed for inflationary models. The constraints are reduced to a set of simple design rules including "fast-roll" parameters analogous to the "slow-roll" parameters in inflation.