Speaker
Description
We present a comparative analysis of the fluctuation field in the expansion rate of the local universe ($z<0.1$) using galaxy samples (Cosmicflows-4) and supernova samples (Pantheon+). Employing spherical harmonic decomposition, we examine the anisotropy patterns across different redshift shells and observe a significant coherence in these patterns extending to the deepest regions investigated. We extract the multipole moments of relevant covariant cosmographic parameters characterizing the distance-redshift relation (up to third order in redshift). We finally show how our analysis serves as a crucial tool for determining the motion of the matter-comoving frame relative to the cosmic microwave background (CMB) frame at varying distances from the terrestrial observer.
