The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: geometry and growth from the anisotropic void-galaxy correlation function in the luminous red galaxy sample

Understand

We present an analysis of the anisotropic redshift-space void-galaxy correlation in configuration space using the Sloan Digital Sky Survey extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 16 luminous red galaxy (LRG) sample.

• This sample consists of LRGs between redshifts 0.6 and 1.0, combined with the high redshift $z>0.6$ tail of the Baryon Oscillation Spectroscopic Survey Data Release 12 CMASS sample.
• We use a reconstruction method to undo redshift-space distortion (RSD) effects from the galaxy field before applying a watershed void-finding algorithm to remove bias from the void selection.
• We then perform a joint fit to the multipole moments of the correlation function for the growth rate $f\sigma_8$ and the geometrical distance ratio $D_M/D_H$, finding $f\sigma_8(z_\mathrm{eff})=0.356\pm0.079$ and $D_M/D_H(z_\mathrm{eff})=0.868\pm0.017$ at the effective redshift $z_\mathrm{eff}=0.69$ of the sample.