Cosmology without inflation

Patrick Peter and Nelson Pinto-Neto
Phys. Rev. D 78, 063506 – Published 2 September 2008

Abstract

We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce. This category of models, being geodesically complete, is nonsingular and horizon-free and can be made to prevent any relevant scale to ever have been smaller than the Planck length. In this scenario, one can find new ways to solve the standard cosmological puzzles. One can also obtain scale invariant spectra for both scalar and tensor perturbations: this will be the case, for instance, if the contracting Universe is dust-dominated at the time at which large wavelength perturbations get larger than the curvature scale. We present a particular example based on a dust fluid classically contracting model, where a bounce occurs due to quantum effects, in which these features are explicit.

  • Received 18 March 2008

DOI:https://doi.org/10.1103/PhysRevD.78.063506

©2008 American Physical Society

Authors & Affiliations

Patrick Peter1,* and Nelson Pinto-Neto2,†

  • 1GReCO—Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France
  • 2ICRA—Centro Brasileiro de Pesquisas Físicas—CBPF, rua Xavier Sigaud, 150, Urca, CEP22290-180, Rio de Janeiro, Brazil

  • *peter@iap.fr
  • nelsonpn@cbpf.br

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Issue

Vol. 78, Iss. 6 — 15 September 2008

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