Cosmology Intertwined II: The Hubble Constant Tension

Abstract

The current cosmological probes have provided a fantastic confirmation of the standard $\Lambda$ Cold Dark Matter cosmological model, that has been constrained with unprecedented accuracy. However, with the increase of the experimental sensitivity a few statistically significant tensions between different independent cosmological datasets emerged. While these tensions can be in portion the result of systematic errors, the persistence after several years of accurate analysis strongly hints at cracks in the standard cosmological scenario and the need for new physics. In this Letter of Interest we will focus on the $4.4\sigma$ tension between the Planck estimate of the Hubble constant $H_0$ and the SH0ES collaboration measurements. After showing the $H_0$ evaluations made from different teams using different methods and geometric calibrations, we will list a few interesting new physics models that could solve this tension and discuss how the next decade experiments will be crucial.

Snowmass2021 - Letter of Interest

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• Probing dark energy using anisotropies in the clustering of post-EoR HI distribution
• The Role of Gravitational Energy Flux in Cosmic Acceleration
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• A Bayesian estimator for peculiar velocity correction in cosmological inference from supernovae data
• Interacting dark energy from redshift-space galaxy clustering
• $f(T,B)$ cosmography for high redshifts
• Revisiting the Matter Creation Process: Observational Constraints on Gravitationally Induced Dark Energy and the Hubble Tension
• Controlled Tension Forecasting: Quantifying Cross-Probe Biases in ${\omega }_0{\omega }_a$CDM
• The holographic origin of future singularities and the role of spatial curvature in cosmic expansion
• Current constraints on the minimally extended varying speed of light model through the cosmic distance duality relation
• Bouncing Cosmologies in modified gravity with space time torsion
• Holographic dark energy in modified Kaniadakis cosmology
• Yellow Post-Asymptotic-Giant-Branch Stars as Standard Candles. I. Calibration of the Luminosity Function in Galactic Globular Clusters
• Production of Primordial Gravitational Waves in Teleparallel Gravity