PIRSA:24090153

Squeezing primordial non-Gaussianity out of the matter bispectrum (and trispectrum) with consistency relations

Goldstein, S. (2024). Squeezing primordial non-Gaussianity out of the matter bispectrum (and trispectrum) with consistency relations. Perimeter Institute. https://pirsa.org/24090153

Goldstein, Sam. Squeezing primordial non-Gaussianity out of the matter bispectrum (and trispectrum) with consistency relations. Perimeter Institute, Sep. 24, 2024, https://pirsa.org/24090153 

          @misc{ pirsa_PIRSA:24090153,
            doi = {10.48660/24090153},
            url = {https://pirsa.org/24090153},
            author = {Goldstein, Sam},
            keywords = {Cosmology},
            language = {en},
            title = {Squeezing primordial non-Gaussianity out of the matter bispectrum (and trispectrum) with consistency relations},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {sep},
            note = {PIRSA:24090153 see, \url{https://pirsa.org}}
          }

Sam Goldstein

Columbia University

Talk number
PIRSA:24090153
Collection
Talk Type
Subject
Abstract

In this seminar, I will discuss recent progress towards developing robust methods to constrain PNG in the non-linear regime based on the LSS consistency relations — non-perturbative statements about the structure of LSS correlation functions derived from symmetries of the LSS equations of motion. Specifically, I will present non-perturbative models for the squeezed matter bispectrum and collapsed matter trispectrum in the presence of local PNG, as well as in the presence of a more general “Cosmological Collider” signal sourced by inflationary massive particle exchange. Using N-body simulations with modified initial conditions, I will demonstrate that these models yield unbiased constraints on the amplitude of PNG deep into the non-linear regime (k~2 h/Mpc at z=0). Finally, I will discuss how these non-perturbative methods can provide insight into the scale-dependent bias signature associated with the Cosmological Collider scenario.