Speaker
Description
I will present cosmological results obtained from the cross-correlation of DESI DR2 spectroscopic galaxies with CMB lensing reconstructions from ACT and Planck. This combination of galaxy surveys and CMB lensing provides powerful, percent level constraints on the growth of structure over a wide range of redshifts from $z=0.1$ to $z=2.1$. We further extend the redshift coverage of our analysis with the inclusion of the CMB lensing auto-correlation, reconstructing matter density perturbation out to $z\gtrsim 5$. By combining with Baryon Acoustic Oscillations (BAO), primary CMB observations, and other cosmological proves we place tight constraints on various extended cosmologies including massive neutrinos and evolving dark energy. Beyond cosmological results I will present advances in testing for and mitigating potential systematics in these measurements and our theoretical model.