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

HySBI - Hybrid Simulation-Based Inference

Nov 30, 2023, 4:30 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
Talk New York Contributed talks


Dr Chirag Modi (Flatiron Institute)


We present a novel methodology for hybrid simulation-based inference (HySBI) for large scale structure analysis in cosmology. Our approach combines perturbative analysis on the large scales which can be modeled analytically from first principles, with simulation based implicit inference (SBI) on small, non-linear scales that cannot be modeled analytically. As a proof-of-principle, we apply our method to dark matter density fields to constrain cosmology parameters using power spectrum on the large scales, and power spectrum and wavelet coefficients on small scales. We highlight how this hybrid approach can mitigate the computational challenges in applying SBI to the future cosmological surveys, and discuss the roadmap to extend this approach for analyzing survey data.

Primary author

Dr Chirag Modi (Flatiron Institute)


Oliver Philcox (Columbia University)

Presentation materials