Abstract
We discuss the possibility of identifying anisotropic and/or inhomogeneous cosmologicalmodels using type Ia supernova data. A search for correlations in current type Ia peakmagnitudes over a large range of angular scales yields a null result. However, the sameanalysis limited to supernovae at low redshift shows a feeble anticorrelation at the2σ level atangular scales θ≈40°. Upcoming data from, e.g., the SNLS (Supernova Legacy Survey) and the SDSS-II(SDSS: Sloan Digital Sky Survey) supernova searches will improve our limitson the size of—or possibly detect—possible correlations also at high redshiftat the per cent level in the near future. With data from the proposed SNAP(SuperNova Acceleration Probe) satellite, we will be able to detect the inducedcorrelations from gravitational lensing on type Ia peak magnitudes on scales less than adegree.
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