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

TL;DR

This paper presents detailed three-dimensional gravitational field reconstructions of the local universe using CosmicFlows-4 data, measuring structure growth rates, bulk flows, and Hubble constant estimates with high precision.

Contribution

It provides the first publicly available 3D gravitational field maps of the local universe below z=0.8 based on CosmicFlows-4, along with new measurements of structure growth and Hubble constant.

Findings

Reconstructed 3D gravitational fields from CosmicFlows-4 data.

Measured growth rate of structure f sigma8 around 0.30-0.38.

Estimated Hubble constant near 75 km/s/Mpc.

Abstract

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).