Designing Cyclic Universe Models

Justin Khoury, Paul J. Steinhardt, Neil Turok

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)4
Number of pages1
JournalPhysical review letters
Issue number3
StatePublished - 2004

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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