We test the consistency of the cosmic growth of structure predicted by General Relativity (GR) and the cosmic expansion history predicted by the cosmological constant plus cold dark matter paradigm (ΛCDM) by combining galaxy cluster data from ROSAT and Chandra, cosmic microwave background (CMB) data from WMAP, and galaxy clustering data from WiggleZ, 6dFGS and SDSS-III BOSS. The combination of these three independent, well studied measurements of the evolution of the mean energy density and its fluctuations is able to break strong degeneracies between growth parameters. To further tighten the constraints on the expansion parameters, we also include supernova, Cepheid variable and baryon acoustic oscillation data. For a spatially flat geometry, accounting for systematic uncertainties, and allowing for convenient departures from the expansion and growth histories of GR+ΛCDM, we obtain results that are in excellent agreement with this model and represent the tightest and most robust simultaneous constraint on cosmic growth and expansion to date.
|Title of host publication||The Thirteenth Marcel Grossmann Meeting|
|Publication status||Published - 1 Mar 2015|