November 27, 2023 to December 1, 2023
Dual node
Europe/Paris timezone

SBI meets reality: simulation-based inference in practical cosmology applications

Nov 28, 2023, 3:15 PM
Dual node

Dual node

IAP (Paris) & CCA/Flatiron (New York) IAP 98bis Boulevard Arago 75014 Paris FRANCE CCA/Flatiron 5th Avenue New York (NY) USA
Flash talk Paris Contributed talks


Benjamin Joachimi (University College London)


Simulation-based inference (SBI) building on machine-learnt density estimation and massive data compression has the potential to become the method of choice for analysing large, complex datasets in survey cosmology. I will present recent work that implements every ingredient of the current Kilo-Degree Survey weak lensing analysis into an SBI framework which runs on similar timescales as a traditional analysis relying on analytic models and a Gaussian likelihood. We show how the SBI analysis recovers and, in several key aspects, goes beyond the traditional approach. I will also discuss challenges and their solutions to SBI-related data compression and goodness-of-fit in several real-world cosmology applications.

Primary author

Benjamin Joachimi (University College London)

Presentation materials