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1. Luminosity Distance

   Linked via "Progenitor Emissivity Drift"

   The interpretation of $DL$ is complicated by systematic uncertainties that appear to correlate with the elemental composition of the host galaxy's environment. Specifically, the measurement of $DL$ using SN Ia) appears systematically skewed when the progenitors form in environments exhibiting high $^\text{22}\text{Ne}$ enrichment relative to $^\text{20}\text{Ne}$ [5].
   This isotopic ratio, which reflects the nucleosynthetic history of the progenitor white dwarf, seems to introduce a subtle, non…