Abstract
The ΛCDM cosmological model provides to first approximation a good description of the universe, but various tensions with data, most notably Hubble tension, persist. In this work we confront ΛCDM with the Pantheon Type Ia supernovae dataset and perform a two-parameter fit of the distance modulus for a running cut-off zmax. We observe that in a window between zmax ≈ 0.1 and zmax ≈ 0.16 there is a 1–2 σ discrepancy with the Planck value ωm = 0.315 ± 0.007, which points to a potential matter underdensity. For high-energy theorists, the analysis appears to support the de Sitter Swampland conjecture.
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