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Backreaction and the Role of Spatial Curvature in the Cosmic Neighborhood

  • Authors: Marco Galoppo, Thomas Buchert, Pierre Mourier

Marco Galoppo et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 2.

The present-day averaged energy budget, as measured by the ﹩{{\rm{\Omega }}}_{i}^{{ \mathcal D },0}﹩ parameters, computed within the CF4++ reconstruction for concentric spherical averaging domains ﹩{ \mathcal D }﹩ of varying comoving radius r, from r = 30 Mpc h−1 to r = 300 Mpc h−1. The green and yellow horizontal dashed lines represent the ΛCDM background values used in the reconstruction for ﹩{{\rm{\Omega }}}_{M}^{0}﹩ and ﹩{{\rm{\Omega }}}_{{\rm{\Lambda }}}^{0}﹩, respectively. A nonnegligible ﹩{{\rm{\Omega }}}_{{ \mathcal R }}^{{ \mathcal D },0}﹩ is observed throughout the surveyed volume, while ﹩{{\rm{\Omega }}}_{{ \mathcal Q }}^{{ \mathcal D },0}﹩ remains very small with only minor fluctuations (shown in the zoomed-in inset, where the shaded area denotes the 1σ statistical uncertainties). Convergence to the global ΛCDM background is not observed within this range of scales.

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