Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

GR: Fachverband Gravitation und Relativitätstheorie

GR 10: Cosmo II

GR 10.3: Vortrag

Donnerstag, 3. April 2025, 14:35–14:55, ZHG008

Connecting Field-level and Summary Statistics — •Ivana Nikolac, Fabian Schmidt, and Beatriz Tucci — Max Planck Institut fur Astrophysik, Karl Schwarzschild Straße 1, 85748 Garching, Germany

Current methods for extracting cosmological information from galaxy distributions typically involve modelling and analysing the power spectrum or the 2-point correlation function. Expanding beyond the power spectrum can unveil significantly more information, including better constraints on dark energy and inflation models. Employing a Lagrangian EFT-based forward model, LEFTfield, other summary statistics can be investigated. These can then be used to obtain the posterior of the cosmological and bias parameters through simulation-based inference (SBI). A primary goal is to assess how the cosmological constraints obtained through SBI compare with those derived from field-level inference.

Keywords: effective field theory; simulation-based inference; summary statistics