| Abstract: |
In the last decade, measurements of weak lensing and galaxy clustering have progressed in precision to the point where they are now comparable in constraining power to measurements of the Cosmic Microwave Background. In the process, they have revealed a tantalizing hint of tension between the amount of structure in our Universe today, and that predicted by measurements of the CMB. The ongoing Dark Energy Spectroscopic Instrument (DESI) survey holds the potential to shed light on the nature of this tension, but the unprecedented precision afforded by DESI will require exquisite control of modeling systematics, especially related to galaxy bias. In this talk, I will discuss a new modeling approach, called Hybrid Effective Field Theory (HEFT) that combines the virtues of both perturbation theory and simulation based modeling. In combination with a new suite of simulations, called Aemulus nu, HEFT will allow consistent and robust extraction of information from redshift space distortions and weak lensing cross correlations measured with galaxies in the first year of DESI data, providing a new perspective on the growth of structure tension. |
