Tanveer Karim is an Arts & Sciences Postdoctoral Fellow at the University of Toronto and obtained his PhD from Harvard University in 2023. He is currently a co-lead of the Lyman-Break Galaxies Topical Team in the Dark Energy Science Collaboration (DESC) and has led efforts related to the Emission-Line Galaxies in the Dark Energy Spectroscopic Instrument (DESI) Collaboration. His research interest focuses on using galaxy surveys at z > 1 to constrain cosmological parameters using cross-correlation, as well as on developing robust Bayesian inference techniques for cosmological analyses. Outside of research, Tanveer is interested in mentoring and outreach, and enjoys learning languages and playing board games.
Title: Large-Scale Structures at 𝑧 ≥ 1: Opportunities with Tomography and Cross-Correlations
Abstract: Over the past decade, cosmology has encountered significant tensions between different measurements of key cosmological parameters, particularly when comparing the cosmic microwave background (CMB) with data from large-scale structures. Historically, large-scale structure observations have primarily focused on the Universe below redshift 1. However, ongoing and upcoming surveys, such as DESI and the Rubin Observatory, are expanding these measurements beyond redshift 1, opening new avenues for exploration. In this talk, I will discuss the exciting opportunities and the challenges of probing the Universe at 𝑧 ≥ 1 using galaxy tracers. I will present recent results from the cross-correlation of DESI Legacy Imaging Surveys’ Emission-Line Galaxies with Planck CMB lensing to constrain the parameters OmegaM and sigma8. Additionally, I will examine how Galactic foreground modeling could become a major systematic hurdle in future high-redshift analyses