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Author Spotlight: Universal Molecular Retention with 11-Fold Expansion Microscopy
Published on: October 6, 2023
Isotropy of Hubble Expansion in the Early and Late Universe
Alan Junzhe Zhou1, Scott Dodelson2, Daniel Scolnic3
1University of Chicago, University of Chicago, Department of Physics, Chicago, Illinois 60637, USA and Kavli Institute for Cosmological Physics, Chicago, Illinois 60637, USA.
Abstract:
We test the isotropy of Hubble expansion by combining several probes for the first time, constructing full-sky maps of expansion rate variation using Type Ia supernovae, fundamental plane galaxies, and cosmic microwave background (CMB) temperature fluctuations. We find no hint of anisotropy or correlation between early- and late-Universe expansion across all systematic models. The 99% confidence upper limits on expansion rate anisotropy are 0.39% for low-redshift supernovae, 0.95% for high-redshift CMB, and 0.37% when combined at a 60-degree smoothing scale. A significant anomaly in the fundamental plane residual map may reflect systematics in the current dark energy spectroscopic instrument dataset, as evidenced by the absence of cross-correlation with other tracers and its correlation with spatial density variations.
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