Local measurement of H0

Synopsis:Prototype class for local Hubble parameter measurements
Author: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)'