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Backreaction and the Role of Spatial Curvature in the Cosmic Neighborhood
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DOI：10.3847/2041-8213/ae5f73.png)
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Abstract
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We present the first direct computation of spatially averaged dynamical quantities in the local Universe, employing the Cosmicflows-4++ reconstruction and a covariant scalar averaging formalism. We extract the domain-averaged density, expansion rate, spatial curvature, and kinematical backreaction over cosmologically relevant domains around our Galaxy, extending up to a comoving radius of 300 Mpc h-1. The resulting domain-averaged present-day energy budget features nontrivial variations with scale that reflect a nested structure within the cosmic neighborhood, including a large-scale void shell encompassing the local cosmic web. Remarkably, we find significant contributions to this energy budget from the average spatial curvature at the O(10%) level on all probed scales. By contrast, the kinematical backreaction remains much smaller throughout the surveyed volume, reaching at most a O(1%) contribution on the smallest scales considered, i.e., 30 Mpc h-1. Convergence to the global Lambda CDM background is not observed within this range of scales.
Keywords:
COSMOLOGICAL INITIAL CONDITIONS
LAGRANGIAN PERTURBATION-THEORY
GALAXY PECULIAR VELOCITIES
DIGITAL SKY SURVEY
INHOMOGENEOUS FLUIDS
GENERAL-RELATIVITY
AVERAGE PROPERTIES
LOCAL UNIVERSE
NUMERICAL SIMULATIONS
DENSITY
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