Can All Cosmological Observations Be Accurately Interpreted with a Unique Geometry?

Pierre Fleury, Hélène Dupuy, and Jean-Philippe Uzan
Phys. Rev. Lett. 111, 091302 – Published 29 August 2013

Abstract

The recent analysis of the Planck results reveals a tension between the best fits for (Ωm0, H0) derived from the cosmic microwave background or baryonic acoustic oscillations on the one hand, and the Hubble diagram on the other hand. These observations probe the Universe on very different scales since they involve light beams of very different angular sizes; hence, the tension between them may indicate that they should not be interpreted the same way. More precisely, this Letter questions the accuracy of using only the (perturbed) Friedmann-Lemaître geometry to interpret all the cosmological observations, regardless of their angular or spatial resolution. We show that using an inhomogeneous “Swiss-cheese” model to interpret the Hubble diagram allows us to reconcile the inferred value of Ωm0 with the Planck results. Such an approach does not require us to invoke new physics nor to violate the Copernican principle.

  • Figure
  • Received 3 June 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.091302

© 2013 American Physical Society

Authors & Affiliations

Pierre Fleury1,2,*, Hélène Dupuy1,2,3,†, and Jean-Philippe Uzan1,2,‡

  • 1Institut d’Astrophysique de Paris, UMR-7095 du CNRS, Université Pierre et Marie Curie, 98 bis boulevard Arago, 75014 Paris, France
  • 2Sorbonne Universités, Institut Lagrange de Paris, 98 bis boulevard Arago, 75014 Paris, France
  • 3Institut de Physique Théorique, CEA, IPhT, URA 2306 CNRS, F-91191 Gif-sur-Yvette, France

  • *fleury@iap.fr
  • helene.dupuy@cea.fr
  • uzan@iap.fr

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Issue

Vol. 111, Iss. 9 — 30 August 2013

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