http://arxiv.org/abs/1803.08915
We present measurements of $E_G$, a probe of gravity from large-scale structure, using BOSS LOWZ and CMASS spectroscopic samples, with lensing measurements from SDSS (galaxy lensing) and Planck (CMB lensing). Using SDSS lensing and the BOSS LOWZ sample, we measure $\langle E_G\rangle=0.37^{+0.036}{-0.032}$ (stat) $\pm 0.026$ (systematic), consistent with the predicted value from the Planck $\Lambda$CDM model, $E_G=0.46$, considering the impact of systematic uncertainties. Using CMB lensing, we measure $\langle E_G\rangle=0.43^{+0.068}{-0.073}$ (stat) for LOWZ (statistically consistent with galaxy lensing and Planck predictions) and $\langle E_G\rangle=0.39^{+0.05}_{-0.05}$ (stat) for the CMASS sample, consistent with the Planck prediction of $E_G=0.40$ given the higher redshift of the sample. We also study the redshift evolution of $E_G$ by splitting the LOWZ sample into two samples based on redshift, with results being consistent with model predictions at $2.5\sigma$ (stat) or better. We correct for the effects of non-linear physics and different window functions for clustering and lensing using analytical model and simulations, and demonstrate that these corrections are effective to $\sim 1-2$\%, well within our statistical uncertainties. For the case of SDSS lensing there is an additional $\sim5\%$ combined systematic uncertainty from shear calibration and photometric redshift uncertainties.
S. Singh, S. Alam, R. Mandelbaum, et. al.
Mon, 26 Mar 18
15/43
Comments: 14+9 Pages. Submitted to MNRAS. Comments welcome
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