Antón is a cosmologist and BCCP postdoctoral fellow at UC Berkeley and LBNL. His research lies at the interface of CMB and large-scale structure, combining theoretical work with data analysis of to try to understand what drove the accelerated expansion of the Universe at the earliest and most recent of times. He is heavily involved in the DESI and Simons Observatory collaborations, with a focus on developing and exploting synergies between the two.
Title: Better together: insights and tools for joint analyses of clustering and lensing in cosmology
Abstract: Recent observations appear to have unveiled inconsistencies within the standard model of cosmology. One such example is the clustering pattern of galaxies observed by DESI, which points to a possible evolution of the dark energy density over cosmic time. In this talk, I will highlight the benefits of jointly analyzing galaxy clustering alongside the gravitational lensing induced by the density field that these galaxies trace out. After presenting recent results from a joint analysis of DESI galaxies alongside CMB lensing signals from ACT and Planck, I will discuss novel approaches to maximize the precision and accuracy of such studies. These include: a new algorithm to analyze a wide class of angular statistics directly from the catalogs that is more efficient, accurate and robust than approaches relying on pixelization; data-driven ways to select galaxy samples with fewer fingers-of-God with applications in full-shape modeling, density reconstruction and stacking analyses; a delensing-inspired technique to improve the precision of CMB lensing cross-correlations (particularly useful for placing constraints on primordial non-gaussianity); and finally, a new understanding of the impact of anisotropic redshift distributions in the context of clustering and lensing analyses.