EDE models increase inferred α_s from CMB data, strengthening tension with USR PBH models that predict negative running.
Geometric Constraints on the Pre-Recombination Expansion History from the Hubble Tension
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abstract
I perform a model-independent reconstruction of the background pre-recombination expansion history of the Universe. I find that purely early-time resolutions to the Hubble tension, satisfying the geometric CMB constraints, exist at the background level. This class of solutions requires a smooth transition around matter-radiation equality, characterized by a $\simeq 15\%$ expansion rate enhancement prior to recombination. This result serves as a blueprint for future model-building approaches, providing a background stress-test for Hubble tension proposals.
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2026 2verdicts
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A scalar-vector-tensor theory with late-time-only scalar dynamics provides a mechanism to alleviate the Hubble tension in a unified dark sector framework.
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Unified dark sector and Hubble-tension alleviation in scalar-vector-tensor gravity
A scalar-vector-tensor theory with late-time-only scalar dynamics provides a mechanism to alleviate the Hubble tension in a unified dark sector framework.