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We design a new observable, the $$\eta $$ expansion rate fluctuation, to characterize deviations from linearity and isotropy in the redshift-distance relationship in the local Universe. In order to better decipher the structure and symmetries of the anisotropies in the local expansion rate, we also show its decomposition into spherical harmonic coefficients using several public catalogs of redshift-independent distances, the Cosmicflows-3 and Pantheon data sets, covering the redshift range $$0.01

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The Multipolar Structure of the Local Expansion Rate

  • 会议论文

  • 发表日期：

    2025年

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  • Basheer Kalbouneh,
  • Christian Marinoni,
  • Julien Bel

摘要

We design a new observable, the $$\eta $$ expansion rate fluctuation, to characterize deviations from linearity and isotropy in the redshift-distance relationship in the local Universe. In order to better decipher the structure and symmetries of the anisotropies in the local expansion rate, we also show its decomposition into spherical harmonic coefficients using several public catalogs of redshift-independent distances, the Cosmicflows-3 and Pantheon data sets, covering the redshift range $$0.01