A Whole Cosmology View of the Hubble Constant

Understand

The Hubble constant $H_0$ is the value of the cosmic expansion rate at one time (the present), and cannot be adjusted successfully without taking into account the entire expansion history and cosmology.

• We outline some conditions, that if not quite ``no go'' are ``no thanks'', showing that changing the expansion history, e.g.
• employing dynamical dark energy, cannot reconcile disparate deductions of $H_0$ without upsetting some other cosmological measurement.