Supernovae Ia and Model Dependence

Peter Smale
(University of Canterbury, NZ)


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Hubble diagrams of high redshift Type Ia supernovae clearly show deviation from an Einstein-de Sitter cosmological model. In the context of FLRW cosmology, this deviation can be accommodated by including a dark energy component in the energy density. In the inhomogeneous cosmological model of Wiltshire (2007), this effect is explained as an illusion brought about by the situation of observers within wall regions that separate voids. Fitting supernovae Ia observations to this model is problematic, however, since FLRW assumptions are built into the supernovae Ia data calibration process. This talk will discuss this issue.