Speaker: Mehdi Rezaie (Kansas State University)
Robust Measurements of the Large-Scale Clustering of Galaxies and Quasars
Wide-area galaxy surveys, such as the Rubin Observatory and Dark Energy Spectroscopic Instrument (DESI), along with high-resolution Cosmic Microwave Background (CMB) experiments, such as the Simons Observatory and CMB-S4, will provide a massive torrent of data to tackle fundamental physics problems, such as the physics of the early Universe. However, systematic uncertainties caused by Galactic foregrounds pose a multifaceted challenge as galaxy surveys aim at probing sparser and fainter galaxies out to higher redshifts. Standard data cleaning methods are limited by their assumptions of linearity and improving them is of paramount importance to cosmology in the era of DESI and Rubin. In this talk, I will present a novel approach for treating systematic error, which allows robust galaxy clustering measurements. Then, I will give a summary of our paper "The clustering of galaxies in the completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Primordial non-Gaussianity in Fourier Space" MNRAS (Mueller et al., 2021),where the method has enabled a thorough analysis of local primordial non-Gaussianity with data from SDSS-IV eBOSS.
