CROCS Data Release I: Constraints on the Hubble Constant

TL;DR

This paper presents a new analysis from the CROCS collaboration that reconciles high and low redshift measurements of the Hubble constant by accounting for systematic biases, potentially ending the Hubble tension.

Contribution

It introduces a robust statistical approach that identifies and corrects imperial biasing systematics in cosmological data, unifying previous conflicting measurements of H0.

Findings

Reconciliation of Planck and SH0ES data after bias correction

Identification of imperial biasing systematics at 5σ significance

H0 estimate of 69.00±0.42 km/s/Mpc after corrections

Abstract

Recent cosmological surveys and datasets have highlighted a variety of tensions to the concordance model of our universe, $\Lambda$CDM. Of particular interest is the Hubble tension, the $5.5\sigma$ discrepancy between measurements of the Hubble constant $H_0$ using high redshift CMB data from Planck ($67.27\pm0.60$km$\text{s}^{-1}\text{Mpc}^{-1}$) and low redshift supernovae from SH0ES ($73.2\pm1.3$km$\text{s}^{-1}\text{Mpc}^{-1}$). To avoid stepping on any toes, we have initiated the CROCS collaboration to resolve this tension, gathering experts from across many fields of cosmology, astrophysics, astronomy, machine learning, data science, philosophy, and astrology. In this paper, we present findings from CROCS Data Release 1, corresponding to the first $\sim3$ days and 27 minutes (rest frame) of observation. We perform a robust statistical analysis, showing that Planck and SH0ES both suffer from imperial biasing systematics (IBS) at $5\sigma$ significance. Accounting for these errors by converting to metric units reconciles the high and low redshift data, with $H_0 = 69.00\pm0.420$km$\text{s}^{-1}\text{Mpc}^{-1}$. We thus report that our results are sufficient to end the Hubble tension for good.