Impact of Late-Universe Priors on Early-Universe Measurements of Hubble

Early-universe measurements of the Hubble constant usually find the best-fit value for H₀ given some data and a particular cosmological model. Planck's all-sky survey of the Cosmic Microwave Background is a common choice for this data, and is often supplemented with additional constraints from e.g. the SH0ES collaboration's local measurement of H₀. We aim to quantify the effect of this constraint on early-universe measurements of H₀ by applying it to a variety of cosmological models, including LCDM and Early Dark Energy models.