Cosmic gravitational-wave background in a cyclic universe

Latham A. Boyle, Paul J. Steinhardt, Neil Turok

Research output: Contribution to journalArticlepeer-review

106 Scopus citations


Inflation predicts a primordial gravitational wave spectrum that is slightly “red.” In this Brief Report, we compute both the amplitude and spectral form of the primordial tensor spectrum predicted by cyclic or ekpyrotic models under the assumption that perturbations pass smoothly through the bounce. The spectrum is exponentially suppressed compared to inflation on long wavelengths. The strongest constraint is that the energy density in gravitational waves is less than 10% of the critical density at nucleosynthesis.

Original languageEnglish (US)
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number12
StatePublished - 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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