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Gravity in the Local Universe : density and velocity fields using CosmicFlows-4

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arxiv 2211.16390 v4 pith:ZMLVFCGC submitted 2022-11-29 astro-ph.CO

H. M. Courtois , A. Dupuy , D. Guinet , G. Baulieu , F. Ruppin , P. Brenas This is my paper
classification astro-ph.CO
keywords cosmicflows-4distanceslocalsigma8universearticlecataloggrouped
verification ladder T0 review T1 audit T2 compute T3 formal
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This article publicly releases three-dimensional reconstructions of the local Universe gravitational field below z=0.8 that were computed using the CosmicFlows-4 catalog of 56,000 galaxy distances and its sub-sample of 1,008 type Ia supernovae distances. The article also provides measurements of the growth rate of structure using the pairwise correlation of radial peculiar velocities f sigma8 = 0.38(+/-0.04) (ungrouped CF4), f sigma8 = 0.36(+/-0.05) (grouped CF4), f sigma8 = 0.30(+/-0.06) (SNIa) and of the bulk flow in the 3D reconstructed Local Universe of 230 +/- 136 km s-1 at 300 Mpc of distance from the observer. The exploration of 10,000 reconstructions gives that the distances delivered by the Cosmicflows-4 catalog are compatible with a Hubble constant of H0 = 74.5 +/- 0.1 (grouped CF4), H0 = 75.0 +/- 0.35 (ungrouped CF4) and H0 = 75.5 +/- 0.95 (CF4 SNIa subsample).

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  1. Velocity Reconstruction from KSZ: Measuring $f_{NL}$ with ACT and DESILS

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    The first 3D velocity reconstruction from a photometric galaxy survey detects the galaxy-velocity power spectrum at 11.7 sigma and constrains fNL = -39 +40/-33.

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