paper

The Clustering of Galaxies in the SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Testing Deviations from and General Relativity using anisotropic clustering of galaxies

arXiv:1206.5309 · doi:10.1093/mnras/sts443

Abstract

We use the joint measurement of geometry and growth from anisotropic galaxy clustering in the Baryon Oscillation Spectroscopic Survey Data Release 9 CMASS sample reported by Reid et al. to constrain dark energy properties and possible deviations from the General Relativity. Assuming GR and taking a prior on the linear matter power spectrum at high redshift from the cosmic microwave background (CMB), anisotropic clustering of the CMASS DR9 galaxies alone constrains and for , or for . When combined with the full CMB likelihood, the addition of the anisotropic clustering measurements to the spherically-averaged BAO location increases the constraining power on dark energy by a factor of 4 in a flat CDM cosmology with constant dark energy equation of state (giving ). This impressive gain depends on our measurement of both the growth of structure and Alcock-Paczynski effect, and is not realised when marginalising over the amplitude of redshift space distortions. Combining with both the CMB and Supernovae Type Ia (SNeIa), we find and for , or and assuming . Finally, when a CDM background expansion is assumed, the combination of our estimate of the growth rate with previous growth measurements provides tight constraints on the parameters describing possible deviations from GR giving . For one parameter extensions of the flat CDM model, we find a preference either for or slower growth than in GR. However, the data is fully consistent with the concordance model, and the evidence for these additional parameters is weaker than .

16 pages, 13 figures, 5 tables. Matches published version

References in corpus (26)

Cited by in corpus (168)