FPA-dependent chromatic shifts of +6 to -80 Å bias Roman SN Ia cosmology to Δw0≈-0.06 and Δwa≈0.24 unless corrected to ~20% accuracy; coherent 0.06% shifts are negligible.
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Chromatic Effects Across the Roman Focal Plane: Implications for Supernova Photometry and Measurements of Cosmological Parameters
FPA-dependent chromatic shifts of +6 to -80 Å bias Roman SN Ia cosmology to Δw0≈-0.06 and Δwa≈0.24 unless corrected to ~20% accuracy; coherent 0.06% shifts are negligible.