AST-799intermediate

The Hubble Tension, Systematics & New-Physics Proposals: Observation, Measurement & Evidence

The Hubble tension is the persistent mismatch between some late-universe determinations of the present expansion rate and the lower value inferred from early-universe data such as the CMB within the standard ΛCDM model. Resolving the tension tests the internal consistency of ΛCDM, distance calibration, stellar astrophysics, and possible physics beyond the standard cosmological model.

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The Hubble Tension, Systematics & New-Physics Proposals: Observation, Measurement & Evidence

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AST-798The Hubble Tension, Systematics & New-Physics Proposals: Physical Mechanisms→

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AST-800The Hubble Tension, Systematics & New-Physics Proposals: Advanced Connections→

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A calibration bias can shift local distances and therefore H0, while new early-universe physics can alter the sound horizon used to infer distances from the CMB and BAO.