# Local measurement of H0¶

Synopsis: Prototype class for local Hubble parameter measurements Jesus Torrado

This is a simple gaussian likelihood for the latest local $$H_0$$ measurements using a combination of different data.

It defines the following likelihoods

• H0.riess2018a: A legacy local measurement of $$H_0$$, used in the analysis of Planck data for the Planck 2018 release.
• H0.riess2018b: The latest local measurement of $$H_0$$.

Note

If you use this likelihood, please cite it as:

• H0.riess2018a: A. Riess et al, “New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant” (arXiv:1801.01120)
• H0.riess2018b: A. Riess et al, “Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant” (arXiv:1804.10655)

## Using a different measurement¶

If you would like to use different values for the $$H_0$$ constraint, as a mean and a standard deviation, simply add the following likelihood, substituting mu_H0 and sigma_H0 for the respective values:

likelihood:
my_H0: 'lambda _theory={"H0": None}: stats.norm.logpdf(_theory.get_param("H0"), loc=mu_H0, scale=sigma_H0)'