DESI: Cosmological Constraints from the Joint Analysis of Galaxy Clustering and CMB Gravitational Lensing

The properties of dark energy are manifested in the Universe's expansion history and the growth of cosmic structure, as its negative pressure competes with gravity. By measuring the angular positions and spectroscopic redshifts of millions of galaxies, the Dark Energy Spectroscopic Instrument (DESI) is able to probe both effects with unprecedented precision. We do this by analyzing the full shape of galaxy clustering statistics using the most general model allowed by physical symmetries, which lets us model consistently the signals of interest alongside nuisance effects such as the intricacies of galaxy formation. Combining the clustering of DESI galaxies with the gravitational lensing distortions they imprint on the cosmic microwave background (CMB) then provides a powerful way to improve constraints, allowing us to measure parameters in complementary ways and break key model degeneracies. In this talk, I will provide an update on the DESI Collaboration's progress on such combined analyses, which are yielding increasingly tight constraints on both dark energy and the cosmological model more broadly.