Speaker
Description
I will discuss the applications of the Effective Field Theory (EFT) in cosmology.
I will review the main concepts of the EFT of Large-Scale Structure, a theoretical framework that provides a systematic analytic description of cosmological observables on large scales. I will present a general perturbative model for a tracer of matter that depends on the line-of-sight selection effects, and argue that it applies to the Lyman alpha forest. Then, I will formulate the one-loop EFT model for the cross-spectrum of the Lyman-alpha forest and a generic biased tracer of matter. I will demonstrate that including cross-correlations significantly improves constraints on EFT parameters compared to those obtained from individual auto-power spectra.
I will also discuss implications of the EFT of Dark Energy, which provides a systematic description of linear perturbations in general scalar-tensor theories. Focusing on general Horndeski theories, I will present constraints on modified gravity from the CMB, CMB lensing, CMB ISW-lensing, DESI BAO DR1, and SN Ia datasets. I will show that the inclusion of CMB ISW-lensing cross-correlations improves constraints on modified gravity, reducing the viable parameter space by 40-80%.
