### Abstract

We use the joint measurement of geometry and growth from anisotropic galaxy clustering in the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 9 (DR9) CMASS sample reported byReid et al. to constrain dark energy (DE) properties and possible deviations from the general relativity (GR). 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 Ω_{m} = 0.308 ± 0.022 and 100Ω_{k} = 5.9 ± 4.8 for w = -1, or w = -0.91 ± 0.12 for Ωk = 0. When combined with the full CMB likelihood, the addition of the anisotropic clustering measurements to the spherically averaged baryon acoustic oscillation location increases the constraining power on DE by a factor of 4 in a flat cold dark matter (CDM) cosmology with constant DE equation of statew (givingw=-0.87± 0.05). This impressive gain depends on our measurement of both the growth of structure and the Alcock-Paczynski effect, and is not realized when marginalizing over the amplitude ofredshift-space distortions. Combining with both the CMB and Type Ia supernovae, we find Ω_{m} = 0.281 ± 0.014 and 1000Ω_{k} =-9.2 ± 5.0 for w=-1, or w_{0} =-1.13 ± 0.12 and w_{a} = 0.65 ± 0.36 assuming Ω_{k} = 0. Finally, when a ΛCDM 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 γ = 0.64 ± 0.05. For one-parameter extensions ofthe flat ΛCDM model, we find a ~2s preference either for w > -1 or slower growth than in GR. However, the data are fully consistent with the concordance model, and evidence for these additional parameters is weaker than 2σ.

Original language | English (US) |
---|---|

Pages (from-to) | 1514-1528 |

Number of pages | 15 |

Journal | Monthly Notices of the Royal Astronomical Society |

Volume | 429 |

Issue number | 2 |

DOIs | |

State | Published - 2013 |

### All Science Journal Classification (ASJC) codes

- Astronomy and Astrophysics
- Space and Planetary Science

## Fingerprint Dive into the research topics of 'The clustering of galaxies in the SDSS-III DR9 baryon oscillation spectroscopic survey: Testing deviations fromΛ and general relativity using anisotropic clustering of galaxies'. Together they form a unique fingerprint.

## Cite this

*Monthly Notices of the Royal Astronomical Society*,

*429*(2), 1514-1528. https://doi.org/10.1093/mnras/sts443