Isolating the linear signal when making redshift space distortion measurements

Abstract Constraints on the linear growth rate, fσ8, using small scale redshift space distortion measurements have a significant statistical advantage over those made large scales. However, these need to carefully disentangle and non-linear information when interpreting distortions in terms of fσ8. It is particularly important do this given that some previous found deviation from expectation based ΛCDM model constrained by Planck CMB data. We construct new emulator-based for galaxy clustering with scaling parameters both velocities galaxies, allowing us isolate rate. train emulator simulations AbacusCosmos suite, apply it data extended Baryon Oscillation Spectroscopic Survey (eBOSS) luminous red sample. obtain value fσ8(z = 0.737) 0.368 ± 0.041, 2.3-σ tension 2018 expectation, find less dependence minimum measurement than analyses.