Probing Dark Energy Inhomogeneities with Supernovae

Abstract

We discuss the possibility to identify anisotropic and/or inhomogeneous cosmological models using type Ia supernova data. A search for correlations in current type Ia peak magnitudes over a large range of angular scales yields a null result. However, the same analysis limited to supernovae at low redshift, shows a feeble anticorrelation at the two sigma level at angular scales of about 40 degrees. Upcoming data from, e.g., the SNLS (Supernova Legacy Survey) and the SDSS-II (SDSS: Sloan Digital Sky Survey) supernova searches will improve our limits on the size of - or possibly detect - possible correlations also at high redshift at 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 induced correlations from gravitational lensing on type Ia peak magnitudes on scales less than a degree.

16 pages, 6 figures, matches the published version JCAP06(2008)027

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• Inflation and dark energy from three-forms
• Probing the anisotropic expansion from supernovae and GRBs in a model-independent way
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• Searching for a preferred direction with Union2.1 data
• Probing bulk flow with nearby SNe Ia data
• Measuring dark energy spatial inhomogeneity with supernova data
• Constraining dark energy fluctuations with supernova correlations
• Testing Local Anisotropy Using the Method of Smoothed Residuals I - Methodology
• Twinlike models for parametrized dark energy
• Excessive shift of the CMB acoustic peaks of the Cold Spot area