Processing of cosmological perturbations in a cyclic cosmology

Robert Brandenberger
Phys. Rev. D 80, 023535 – Published 31 July 2009

Abstract

The evolution of the spectrum of cosmological fluctuations from one cycle to the next is studied. It is pointed out that each cycle leads to a reddening of the spectrum. This opens up new ways to generate a scale-invariant spectrum of curvature perturbations. The large increase in the amplitude of the fluctuations quickly leads to a breakdown of the linear theory. More generally, we see that, after including linearized cosmological perturbations, a cyclic universe cannot be truly cyclic.

  • Figure
  • Received 5 June 2009

DOI:https://doi.org/10.1103/PhysRevD.80.023535

©2009 American Physical Society

Authors & Affiliations

Robert Brandenberger

  • Department of Physics, McGill University, Montréal, QC, H3A 2T8, Canada
  • Theory Division, CERN, CH-1211 Geneva, Switzerland

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Issue

Vol. 80, Iss. 2 — 15 July 2009

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