Non-linear structures in novel universes: accessing cosmological collider signals with weak lensing surveys

Speaker: Dhayaa Anbajagane (University of Chicago) In Person and zoom 

Zoom info: https://stanford.zoom.us/my/sihanyuan?pwd=QnpsUHZWWGJ2ekVYWmZVL3BmM0gzZ…

Primordial non-Gaussianities (PNGs) are imprints in the density field caused by particle interactions during the inflationary epoch. A subclass of these signatures (“”cosmological colliders”“) encode information about the interactions and properties of any additional particle fields present during inflation. I introduce a method for producing cosmological simulations with arbitrary collider signals, and present a study of over thirty collider models in the deeply non-linear regime of the density field. I then show how weak lensing surveys offer competitive constraints that are complementary to other probes of PNGs in the late Universe. This simulation framework opens new avenues in constraining particle physics during inflation, including the use of other probes beyond weak lensing.