Observational constraints on self-accelerating cosmology

Abstract

The DGP brane-world model provides a simple alternative to the standard LCDM cosmology, with the same number of parameters. There is no dark energy - the late universe self-accelerates due to an infrared modification of gravity. We compute the joint constraints on the DGP model from supernovae, the cosmic microwave background shift parameter, and the baryon oscillation peak in the SDSS luminous red galaxy sample. Flat DGP models are within the joint 2 sigma contour, but the LCDM model provides a significantly better fit to the data. These tests are based on the background dynamics of the DGP model, and we comment on further tests that involve structure formation.

matches published version - DGP is within joint 2 sigma contour using WMAP3 (1 sigma with WMAP1)

References in corpus (2)

• Dark Energy: Recent Developments
• Observational constraints on modified gravity models and the Poincaré dodecahedral topology

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