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Ruling Out New Physics at Low Redshift as a Solution to the H₀ Tension

Shafieloo, Arman; Keeley, Ryan E.

We make the case that there can be no low-redshift solution to the H₀ tension. To robustly answer this question, we use a very flexible parametrization for the dark energy equation of state such that every cosmological distance still allowed by data exists within this prior volume. To then answer whether there exists a satisfactory solu…

Weighing the Local Interstellar Medium Using Gamma Rays and Dust

Widmark, Axel; Korsmeier, Michael; Linden, Tim

Cold gas forms a significant mass fraction of the Milky Way disk, but is its most uncertain baryonic component. The density and distribution of cold gas is of critical importance for Milky Way dynamics, as well as models of stellar and galactic evolution. Previous studies have used correlations between gas and dust to obtain high-resolution measur…