Can all cosmological observations be accurately interpreted with a unique geometry?

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 to reconcile it with the Planck results. Such an approach does not require us to invoke new physics nor to violate the Copernican principle.

4 pages, 1 figure; typos corrected; v2 matches published version

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• Evidence for an environment-dependent shift in the baryon acoustic oscillation peak
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• The theory of stochastic cosmological lensing
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• The Local Value of $H_0$ in an Inhomogeneous Universe
• Reduced phase space optics for general relativity: Symplectic ray bundle transfer
• Cosmic backreaction and the mean redshift drift from symbolic regression
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• Light propagation in the averaged universe
• Supernovae as probes of cosmic parameters: estimating the bias from under-dense lines of sight
• Effect of inhomogeneities on the propagation of gravitational waves from binaries of compact objects
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• Lightcone Averaging and Precision Cosmology
• Relativistic cosmology number densities in void-Lemaitre-Tolman-Bondi models
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• A Simple Gravitational Lens Model For Cosmic Voids
• Dark Coincidences: Small-Scale Solutions with Refracted Gravity and MOND
• Solving the Hubble tension à la Ellis & Stoeger 1987
• Constraint percolation on hyperbolic lattices
• Post-Newtonian Gravity in Cosmology
• The Effect of Primordial Anti-Biasing on the Local Measurement of the Key Cosmological Parameters
• Refracted Gravity Solutions from Small to Large Scales
• Impact of small scale inhomogeneities on observations of standard candles
• Living in a Non-Flat Universe: Theoretical Formalism
• The averaging problem on the past null cone in inhomogeneous dust cosmologies