Effects of type Ia supernovae absolute magnitude priors on the Hubble constant value

Understand

We systematically explore the influence of the prior of the peak absolute magnitude ($M$) of type Ia supernovae (SNe Ia) on the measurement of the Hubble constant ($H_0$) from SNe Ia observations.

• We consider five different data-motivated $M$ priors, representing varying levels of dispersion, and assume the spatially-flat $\Lambda$CDM cosmological model.
• Different $M$ priors lead to relative changes in the mean values of $H_0$ from 2% to 7%.
• Loose priors on $M$ yield $H_0$ estimates consistent with both the Planck 2018 result and the SH0ES result at the 68% confidence level.