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Coping with Type Ia Supernova "Evolution" When Probing the Nature of the Dark Energy
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Observations of high-redshift Type Ia supernovae (SNe Ia) have provided strong evidence that the dark energy is real, and making further accurate observations of high-redshift SNe Ia is the most promising way to probe the nature of the dark energy. We discuss one of the concerns about such a project - that of coping with SN Ia evolution. We emphasize that SN Ia evolution differs in an important respect from the kind of evolution that has foiled some past projects in observational cosmology, and we outline empirical strategies that will take it into account. The supporting role of physical models of SNe Ia also is discussed. Our conclusion is that systematic errors due to SN Ia evolution will be small.
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Cited by 1 Pith paper
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Environmental dependence of Type Ia supernova standardization on the local luminosity-weighted age
Local luminosity-weighted age produces a 0.163 mag (5.2σ) step in standardized SN Ia luminosity that accounts for most of the host-mass step and can shift the dark-energy equation-of-state parameter w by ~0.3.
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