No deviation found from the distance duality relation in combined DESI, CMB, and supernova data, ruling out dimming as an explanation of the Hubble tension.
Photon-axion oscillations and Type Ia supernovae
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We compute the probability of photon-axion oscillations in the presence of both intergalactic magnetic fields and an electron plasma and investigate the effect on Type Ia supernovae observations. The conversion probability is calculated using a density matrix formalism by following light-paths through simulated universes in a Monte-Carlo fashion. We find, that even though the effect is highly frequency dependent, one needs to analyze relatively narrow spectral features of high redshift objects in order to discern between the dimming effect from oscillations and a cosmological constant, in contrast to earlier claims that broad-band photometry is sufficient.
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Implications for dark energy of cosmic transparency in light of DESI data
No deviation found from the distance duality relation in combined DESI, CMB, and supernova data, ruling out dimming as an explanation of the Hubble tension.