PIRSA:25110110

Bringing the Cosmological collider into the Nonlinear Universe

Anbajagane, D. (2025). Bringing the Cosmological collider into the Nonlinear Universe. Perimeter Institute. https://pirsa.org/25110110

Anbajagane, Dhayaa. Bringing the Cosmological collider into the Nonlinear Universe. Perimeter Institute, Nov. 25, 2025, https://pirsa.org/25110110 

          @misc{ pirsa_PIRSA:25110110,
            doi = {10.48660/25110110},
            url = {https://pirsa.org/25110110},
            author = {Anbajagane, Dhayaa},
            keywords = {Cosmology},
            language = {en},
            title = {Bringing the Cosmological collider into the Nonlinear Universe},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {nov},
            note = {PIRSA:25110110 see, \url{https://pirsa.org}}
          }

Dhayaa Anbajagane University of Chicago

Talk numberPIRSA:25110110
DOI10.48660/25110110
Collection
Talk Type Scientific Series
Subject

Abstract

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 novel method for producing cosmological simulations with arbitrary collider signals, and present signatures from over thirty collider models in the deeply non-linear regime of the density field. I show how weak lensing surveys can offer competitive constraints that are complementary to other probes of PNGs in the late Universe. This simulation framework expands the probes of nonlinear structure (beyond lensing) that are usable in constraining primordial particle physics, which in turn expands the space of testable models and enhances the precision with which we constrain them.