In the realm of the Hubble tension—a review of solutions ^*

Short summary

A review of theoretical solutions to the Hubble tension, a 4-6σ disagreement between early and late universe measurements of the Hubble constant (H0), finds that while some models improve agreement to 1-2σ, they often do so by increasing H0 uncertainty. Solutions involving early/dynamical dark energy, neutrino interactions, interacting cosmologies, primordial magnetic fields, and modified gravity are highlighted as promising.

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