# Does the Hubble constant depends on the model of the universe used?

I am writing an equation using the Hubble constant. My work is based on Dodelson's article on sterile neutrinos which uses a C$$+$$HDM model.In it a value of $$h=0.5$$.

But when reading the more recent Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Observations: Implications for Cosmology, which uses a $$\Lambda$$CDM model, a value of $$h=0.732$$ is used.

Is this because this last article is more recent and the value has been measured more accurately? Or is it because they are different models and therefore I should use the Hubble constant that fits my model?

The article also contains a table with a history of estimates of Hubble's constant. Although estimates since 2002 (basically since Hubble space telescope data became available) have been in the region of $$70$$ km/s/Mpc (corresponding to a $$h$$ value of $$0.7$$), earlier estimates ranged from $$50$$ to $$90$$ km/s/Mpc. The paper you referenced was published in 1994, so it was pre-Hubble. It is likely that it was simply using an older estimate, which we now know to have been inaccurate.